Wednesday

April 23, 2014

April 23, 2014

Number of results: 40,825

**Cosmology**

The equation describing the geometry and mass-energy distribution of a homogeneous and isotropic universe is known as: - The Einstein Equation - The Friedmann Equation - The Robertson-Walker Equation - The Hubble Equation
*Tuesday, January 8, 2013 at 8:13pm by qwerty*

**chemistry**

Add equation 1 to the reverse of equation 2 to equation 3. That will give you twice the equation you want and you can take half of it later. Add kJ/mole for equation to the negative of equation 2 to the kJ for equation 3. All of that together gives twice what you are looking ...
*Sunday, April 11, 2010 at 3:57pm by DrBob222*

**MATH**

I NEED TO SOLVE FOR Y AND X im getting rele confused on this. ok here is the prob. x+y=5 x-2y=-4 equation 1 x+y=5 equation 2 x-2y=-4 Multiply equation 1 by -1. Add equation 1 to equation 2. The x term cancels. Solve for y. THEN, put the value of y into either equation and ...
*Sunday, December 17, 2006 at 8:35pm by Tony*

**Chemistry**

Use equation as is (using arrows to separate reactants from products is a MUST if you are to do this properly) and the H as is. Reverse equation 2 and change the sign of H2. Now add equation 1 to the new equation 2 and add H1 to the reversed equation 2 for delta Hf for the ...
*Wednesday, May 13, 2009 at 2:36pm by DrBob222*

**chemistry**

Add equation 1 to the reverse of equation 2, then add twice equation 3 and twice equation 4. Cancel atoms/molecules common to both sides and check to make sure you have the equation you want. Don't forget to change the sign of any delta H value for which the equation was ...
*Thursday, October 29, 2009 at 7:59pm by DrBob222*

**Chem**

For #1, equation 2 is just the reverse of equation 1. So use K, which is given for equation 1, and take the reciprocal. K for equation 2 will be 1/K(eqn 1).
*Thursday, January 22, 2009 at 11:05pm by DrBob222*

**algebra**

3m+2p=1.8 (qeuation A) 4m+6p=2.9 (equation B) "equation A" times "3": 9m+6p=5.4 (equation A') "equation A'" - "equation B": 5m=2.5 [m=0.5] substitude "m=0.5" into "equation A": 3(0.5)+2p=1.8 1.5+2p=1.8 2p=0.3 [p=0.15]
*Wednesday, June 16, 2010 at 4:08pm by Maggie*

**for Drbob222**

Write equation 1. 4p + 3g = #1.30 Write equation 2. 2p + 4g = #1.20 Now multiply equation 2 by 2 to give 4p + 8g = #2.40 Now multiply that equation by -1 -4p - 8g = -#2.40 Now add this last equation to equation 1. You see the +4p from equation 1 and the -4p from equation 2 add...
*Monday, October 29, 2007 at 4:47pm by DrBob222*

**chemistry **

Label the equation you have as 1, 2, 3. Use equation 1 as is. Use equation 2 as is. Reverse equation 3 (change the sign of DH when you reverse an equation), than add all of them and the new DHs. Check to make sure the equation is what you wnat, the It will be DH(1) + DH(2...
*Monday, October 25, 2010 at 2:30pm by DrBob222*

**solution of an equation**

can someone please give me an example of a solution of an equation An equation is a statment with the equal sign = in it. If we have y=2x+3 and we're asked to find x when y=7 then we would have to solve 7=2x+3 The solution of that equation is x=2. Was there a specific equation...
*Thursday, September 28, 2006 at 11:49pm by alejandra*

**chemistry**

Reverse equation 2 and equation 3 and add them to equation 1. See if that isn't the equation you want. When you reverse an equation you change the sign for delta H for that reaction. Then add all of the DH values.
*Wednesday, January 25, 2012 at 1:05am by DrBob222*

**Chem 121**

I believe you have made a typo in the final equation. I don't think you can obtain equation 3 from 1 and 2. If you intended to write CH4 + 2Cl2 ==> CH2Cl2 + 2HCl, then just add equation 1 to equation 2.
*Tuesday, March 29, 2011 at 4:49pm by DrBob222*

**math**

| x - 4 |-| 7 - x | = 1 | x - 4 | = 1 + | 7 - x | Eliminate the absolute values: First equation : ( - ( x - 4 ) ) = ( 7 - x ) + 1 Second equation : ( x - 4 ) = ( 7 - x ) + 1 Third equation : ( x - 4 ) = ( - ( 7 - x ) ) + 1 Fourth equation : ( x - 4 ) = ( 7 - x ) + 1 You have ...
*Saturday, May 5, 2012 at 3:36pm by Bosnian*

**APChemistry**

It does; however, you asked for the NET ionic equation and not the ionic equation. If you use the ionic equation and cancel the ion common to both sides (the Na^+), the net ionic equation results. In addition, I see I made a typo in the molecular equation. It is NaOBr + HOH...
*Sunday, April 18, 2010 at 9:43pm by DrBob222*

**Pre-algebra**

An equation is a statement of equality containing one or more variables. To solve an equation means, find the value of the variable for which the equation satisfy An example of an equation is x + 5 12. Solution: x + 5 = 12 x = 12 - 5 x = 7 7 is a solution of the equation x + 5...
*Saturday, May 21, 2011 at 1:01pm by clarissa*

**precalc**

equations one is a point. Equation 3 has no solution. Equation 2 is not in x at all. So what does Linear equation mean? Most agree it is a polynomial equation of degree one. Are any of the above polynomials?
*Monday, September 14, 2009 at 5:17pm by bobpursley*

**Math**

I will assume that your equation is such that the vertex is on the y-axis Then your equation will be y = ax^2 + 15 , (the h of your equation will be zero) then (6,8) must lie on the equation 8 = a(6)^2 + 15 a = -7/36 equation: y = (-7/36)x^2 + 15
*Sunday, August 22, 2010 at 8:28pm by Anonymous*

**Q2**

Question2 In (dy/dx) + yP(x) = y^n Q(x), if n = 1 the equation would be reduced to a A Bernoulli Equation B Exact equation C Variable Separable When n=1, the equation reduces to: y' + yP(x) = yQ(x) y' = y(P(x)+Q(x)) y'/y = P(x) + Q(x) Does that look familiar to you?
*Monday, December 14, 2009 at 9:42am by MathMate*

**Math**

Multiply the first equation by 2. Add that equation to the second equation. Solve this new equation for x. Now substitute your value for x into either one of the original equations and solve for y.
*Wednesday, April 17, 2013 at 7:30pm by rbowh*

**Find the equation....**

Find the equation with the given properties. Express the equation in slope intercept form. Containing points p=(-4,-2) and Q=(-2,1) What is the equation of the line? y=
*Sunday, April 14, 2013 at 1:38pm by Lauren*

**adult education**

Looks like a classical algebra problem to me. 280lbs=S+C weight equation 280*.09=.14S+.07C protein equation How to solve? I would multiply the top equation by .07, then subtract one equation from the other.
*Saturday, October 23, 2010 at 3:52pm by bobpursley*

**Algebra**

that's because you are really given only one equation if you multiply the first equation by -3 you get your second equation so by subtracting them you get 0 = 0 if that happens, there will be an infinite number of solutions, namely any point that satisfies the first equation.
*Saturday, April 25, 2009 at 11:50pm by Reiny*

**Calculus**

Solve the differential equation dy/dx = -xe^y and determine the equation of the curve through P(1,2) I tried solving the differential equation and I get y = log(x^2/2 + C). Is this correct? Now I forgot how to find the equation. Thank you!
*Monday, August 6, 2012 at 8:20pm by Robert*

**Chemistry **

Reverse equation 1 and add to equation 2. That will give you the equation desired at the end. Reverse the sign for delta H when the equation is reversed.
*Friday, February 18, 2011 at 12:36am by DrBob222*

**susbstitution method**

Well these would be two equation so: y=6-x (1) y=x+2 (2) so, substitute equation (1) y=6-x into equation (2) therefore, 6-x=x+2 6-2=x+x 4=2x 4/2=x 2=x for x=2, substitute x in equation (1) y=6-2 y=4 x=2 , y=4
*Wednesday, February 17, 2010 at 12:16pm by Ren*

**8th grade math**

how do you make an equation that is parallel to another equation? how do you make an equation that is perpendicular to another equation? please help and explain. Thank you.
*Sunday, March 4, 2012 at 9:18pm by saranghae12*

**Question**

You see, here's what I did. I changed the "t" in the equation that both of you gave me (75t=125(t-2)) to an x so I could use elimination to solve the problem. That made that equation be 125x - 250 = 75x + 75x = 125 y That's where my problem comes along... it gets all weird and...
*Monday, February 23, 2009 at 4:29pm by Willow*

**Algebra II**

Substitute x = i t where t is assumed to be real: t^4 - 3it^3 - 7t^2 -6 i t - 13 = 0 Take the imaginary part of the equation: t^3 + 2 t = 0 ---> t(t^2 + 2) = 0 Now, we can see from the original equation for t that t = 0 is not a solution (this is actually implied by the ...
*Sunday, February 17, 2008 at 11:45am by Count Iblis*

**Chemistry - Le Chatelier's Principle**

I don't know what it is you don't understand. Frankly you seem to understand it very well. You add H3O^+ and the rxn shifts to the right producing more dichromate which is what you want. The equation is already there. That is the initial equation, the intermediate equation, ...
*Sunday, March 9, 2014 at 1:30pm by DrBob222*

**Algebra**

The equation for a straight line is y = mx + b Substitute 4 for y and -3 for m in the equation to obtain equation #1. Do the same, substituting 6 for y and -9 for x to obtain equation #2. Then solve the two equations simultaneously to obtain x and b.
*Wednesday, May 28, 2008 at 5:38pm by DrBob222*

**chemistry**

Start with the end equation. FeO(s) + CO(g) ==> Fe(s) + CO2(g) I want an Fe(s) on the right and CO2(g) on the right. The first equation has that so write that one as is (at least for the time being). I would reverse equations 2 and 3 and multiply equation 1 by 3, equation 2...
*Wednesday, March 26, 2008 at 10:08pm by DrBob222*

**Math**

Identify the equation as an identity, inconsistent equation or conditional equation. 1-3/2x=7/4 my answer is it is an inconsistent equation
*Friday, March 21, 2008 at 8:22pm by Lisa*

**math**

The two equation are: x + y = 13,000 .17x + .02y = 1910 Use the substitution method of solving systems of equations. Solve the first equation for y, and then plug that into the second equation. You will have all x's in the equation now and can easily solve it.
*Sunday, November 25, 2007 at 7:52pm by Michael*

**maths**

first equation, combine that with the second and third equation. S=.3D S=.3*.4D Put that into the last equation. 1) B+D+.12D=608 now, solve for B in the second equation B=D/.4=2.5D Now put that in your equation 1) above, solve for D
*Wednesday, December 28, 2011 at 9:19am by bobpursley*

**physics**

Horizontal equation: 96.4=VicosTheta*4.7 Vertical equation: h=ViSinTheta*4.7-4.9(4.7^2) one last equation: at max height, vy=0 0=ViSinTheta*2.6-4.9(2.6^2) Lets see. Solve the third equation for VisinTheta, put that into the second equation, solve for h (answer b) then max ...
*Wednesday, November 3, 2010 at 5:03pm by bobpursley*

**chemistry**

I don't think so. Let's see how it plays out. I'll go through some of it and let you finish. 3Fe2O3 at top left cancels with 3Fe2O3 on right in equation 2. 2Fe3O4 on left in equation 2 cancels with 2Fe3O4 on right of equation 3. Then 9CO in equation 1(left side) cancels with 1...
*Wednesday, March 26, 2008 at 10:08pm by DrBob222*

**similtaneous equation**

Triple both sides of the first equation; them add it to the last equation. That will get rid of the y term. 3x + 9y = 18 2x - 9y = 7 ------------ 5x = 25 Surely you can take it from there. Once you know x, use either equation to solve for y. They will give the same answer.
*Saturday, November 19, 2011 at 3:54am by drwls*

**math**

The second equation tells you that y = 44 + 5x. Substitute 44 + 5x in place of y in the first equation. You will have to double it, because 2y appears in that equation. Then solve the resulting equation for x.
*Tuesday, February 10, 2009 at 1:23pm by drwls*

**chemistry**

1. Write the balanced molecular equation. 2. Break each component into ions to obtain the complete ionic equation. 3. Cancel ions common to both sides of the equation to obtain the net equation.
*Thursday, October 4, 2012 at 5:46pm by DrBob222*

**calc**

a) when x=e^2, y = lne^2/e^2 = 2/e^2 and y' = (1-lne^2)/e^4 = -1/e^4 so the equation is x + (e^4)y = c but (e^2,2/e^2) lies on it, so e^2 + e^4(2/e^2) = c c = 3e^2 the equation is x + (e^4)y = 3e^2 ( I am using a quick way to find the equation of a line based on the fact that ...
*Monday, May 19, 2008 at 3:16am by Reiny*

**algebra**

does the (1) and (2) mean your saying that is equation 1 and 2 ? if so this is what you do since equation 2 has x isolated already just plug 8 - 2y into x of equation 1 to solve for y and then plug the answer you get into either equation for x
*Tuesday, May 1, 2012 at 10:14pm by visoth*

**Chemistry II**

I didn't get either answer. Look at your equation to make sure it adds to the desired equation in the problem. Here is what I did. equation 1 x 2 equation 2 reversed and x 2. equation 3 x 3. Add it. First look at the equation. (2N2) + 2O2 + 4NH3 + (6H2) +3O2 ==> (2N2) + + (...
*Sunday, November 29, 2009 at 6:37pm by DrBob222*

**Chemistry**

For the equation give the formula equation, ionic equation, and the net ionic equation after predicting the products and balancing. Using the solubility rules to indicate solid or aqueous each formula. AgNO3 + NaCl
*Wednesday, October 30, 2013 at 12:50pm by Cindy*

**Chemistry**

I am having a bit of difficulty getting the net equation and the net ionic equation and the net ionic equation. I think I have the balance equation right. Thanks in advance for any help. For the acid base neutralization reaction of carbonic acid, H2CO3(aq), and lithium ...
*Thursday, March 4, 2010 at 9:24pm by Amanda*

**math**

Yes, very good. The two equation are: x + y = 13,000 .17x + .02y = 1910 Use the substitution method of solving systems of equations. Solve the first equation for y, and then plug that into the second equation. You will have all x's in the equation now and can easily solve it.
*Sunday, November 25, 2007 at 7:52pm by Michael*

**algebra**

-2x-4y = 1 6x + 12y = -3 I just rearranged the second equation. Multiply the top equation by 3 and then add the two equations together. You will get 0 = 0 which means there are an infinite number of solutions. This happens any time you get a true equation. What you will find ...
*Monday, March 4, 2013 at 3:31pm by Dr. Jane*

**math**

okay just equation 1 has b= a - 4 we can plug in a- 4 for b in equation 2 to give you; 2a - 3(a - 4) = -2 2a - 3a +4= -2 -a + 4 = -2 -a = -6 divide by negative 1 to make a postive a= 6 now you can plug in 6 into either equation to solve for b but i would use equation 1 since ...
*Monday, April 30, 2012 at 4:25pm by visoth*

**Linear Equation**

I posted a question below but forgot to put in the equation! So sorry. The problem states: Find 2 numbers that satisfy the equation then graph it. The equation is 2y+2=0 I think one of the numbers is -1, but what could the other be or am I doing the problem incorrectly? Thanks...
*Thursday, September 13, 2007 at 2:57pm by Betty*

**chemistry**

write the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrochloric acid. Formula equation.............. net equation.............
*Sunday, October 30, 2011 at 7:40pm by denis*

**Finite Math**

By inspection, we see that the first equation is a linear combination (4 times) the second equation. Similarly, the third equation can be obtained by multiplying equation 2 three times. Therefore the equations represent 3 coincident lines: x-2y-6z=-5 Let z = t, and y = s, then...
*Sunday, September 11, 2011 at 4:58pm by MathMate*

**alegbra**

for the first, multiply each term by 8, easy after that. for the second, there is an infinite number of solutions. Notice if you double the first equation, you get exactly the second equation. So really you are just given the same equation twice. So, any x and y which ...
*Tuesday, April 7, 2009 at 8:35pm by Reiny*

**5th grade-math**

Let d = the number of dimes. Let q = the number of quarters. What is known... d * $0.10 + q * $0.25 = $1.95 and... q = d - 2 Substitute the above equation for q into the first equation. That gives an equation only in d. Solve for d. Then plug that value into the second ...
*Tuesday, November 3, 2009 at 7:22pm by Quidditch*

**prealgebra**

Multiply equation 1 by -18 and add the result to equation 2. That will eliminate S. Solve for L as you would any algebra equation.
*Tuesday, July 14, 2009 at 3:18pm by DrBob222*

**math**

waterline in my back yard is represented by the equation Y=-1/4x +8 What is the slope of the equation what is the Y intercept of the equation?
*Tuesday, October 5, 2010 at 2:20pm by rick*

**Physics**

you cant use that equation. THe equation is a vector equation, and you added them as scalars. Redo it in each of two directions, perpendicular to each other.
*Monday, April 4, 2011 at 11:08am by bobpursley*

**chemistry**

Reverse equation 1 (change sign of delta H). Multiply equation 2 by 2. Add. Check the equation to make sure that's what you get.
*Tuesday, June 14, 2011 at 10:37pm by DrBob222*

**math**

the equation of the line is y-2 = -2(x-4) 2x + y = 10 by subbing the points into this equation, determine which point(s) , if any, satisfy the equation.
*Monday, September 16, 2013 at 4:06pm by Reiny*

**chemistry**

What kind of a balanced equation are you talking about? You can have the balanced CHEMICAL equation, you can have the balanced MATH equation, or the balanced HEAT equation. I'll assume you want the chemical equation; I also assume that this is the first of several questions. ...
*Monday, March 26, 2012 at 4:32pm by DrBob222*

**Algebra**

To plug in 6 for t, replace t in the equation with 6. For example, given the equation y = x^2+x+5, to find y at x = 1, replace x in the equation with 1. y = x^2 + x + 5 at x=1 y = 1^2 + 1 + 5 See how x is replaced by 1 in the equation? So for v = (1/2)t + 6, how do you think ...
*Friday, August 14, 2009 at 3:35pm by Marth*

**math**

what does it mean to describe the context in which a equation is used. describe the meaning of a equation and the meaning of the variables.what is meant by solution of a equation. my equation is y=2x+3
*Saturday, June 9, 2012 at 9:25am by pat*

**math**

Somtething seems to be wrong with this question to me. This is what i got:[substitution method] y+2x=3 (1) y+2x=-4 (2) from equation (2)y+2x+-4 => y=-4+2x call this equation (3) substitute equation (3) in equation (1) -4+2x+2x=3 4x=7 x=7/4 for x =7/4, substitute x in ...
*Wednesday, February 17, 2010 at 12:20pm by Ren*

**Algebra 1**

The general equation for a straight line is y = mx + b. m is the slope and b is the y intercept. So m = -5 from your equation and 3 is b in your equation.
*Thursday, September 6, 2007 at 9:55pm by DrBob222*

**Chem**

In my opinion it is called the equation or chemical equation. It just happens to be a redox equation
*Wednesday, July 29, 2009 at 9:36pm by DrBob222*

**Math**

1a. equation is r^-2=w/c 2. equation is d=3.6sqrt(h) I forgot to include the equation into the problems.
*Wednesday, April 7, 2010 at 10:04am by Tisha*

**9th grade algebra**

in a), is the coefficent of x the same in each equation? in b), put the first equation into the form y= mx+b. Then, is m=5 as in the second equation?
*Monday, October 5, 2009 at 1:35pm by bobpursley*

**Chemistry**

I think what you want to do is multiply equation 1 by 2 and add to equation 2. I believe that will give you the equation you want. To find the Kp value, it will be (Kp1)^2*Kp2 = ?
*Monday, March 5, 2012 at 10:14pm by DrBob222*

**algebra**

An equation belongs to the same family of graphs as y=3x+5, but it has a y- intercept of 7. How could you graph the equation without finding the equation first?
*Thursday, March 22, 2012 at 9:46pm by Anonymous*

**Algebra**

Find the equation with the given properties. Express the equation in slope intercept form. Containing points p=(-4,-2) and Q=(-2,1) What is the equation of the line? y=
*Sunday, April 14, 2013 at 7:40pm by Jenn*

**math**

1-AND PRODUCTION sum of roots of the equation :X²-X-6=0 2-FOR what values of A the equation has no solution ax ² +3 x-7 = 0 3-For what values of x the equation has 2 solution X²-X+C=0 4-Solve the equation (X-1)²-4=0 5-Solve the equation a)2/2 x^(-3)=2√2 b)3^(x^2-2x)=27 c...
*Sunday, September 26, 2010 at 12:07pm by Anonymous*

**Algebra**

My instructions are to solve the problem by showing the steps and identify as a conditional equation, an inconsistent equation or an identity. 0.06q + 14 = 0.3q - 5.2 You can convert that to 0.24 x = 19.2 and solve it for x. The original equation is neither inconsistent (an ...
*Friday, June 29, 2007 at 1:06am by Bianca*

**math**

Plug in 2x-4 in place of y in the first equation. Solve the resulting equation in x only. Once you have x, use either equation to get y.
*Tuesday, January 22, 2008 at 10:35pm by drwls*

**chemistry(balance equation)**

hi!i am a f4 student in hk.i have know the basic concept of balance equation.but some too complex equation i cant balance.is there any general short cut for balancing any simple or complex chemical equation?
*Thursday, January 19, 2012 at 10:50am by kate*

**math,correction,&help**

Write the equation of the line L satisfying the given geometric conditions. L has y-intercept (0,2) and is perpendicular to the line with equation 2x-3y = 6 Equation of perpendicular line is of the form 3x + 2y = K…It passes through (0,2) 2(2) = K = 4 So, Equation is
*Tuesday, January 16, 2007 at 2:40am by jasmine20*

**math please**

If you are talking about using a quadratic formula, you wrote the equation wrong. As i said before, you did not even write and equation It should have been 3x^2 + 3x -21 = 0, whic is the same as x^2 +x -7 = 0 That equation has only irrational roots. I solved the other equation...
*Wednesday, January 27, 2010 at 8:55am by drwls*

**Math**

We have a quadratic equation here. Do you want to factor this equation? What exactly do you want to do with this equation?
*Tuesday, February 19, 2008 at 7:32pm by Guido*

**Physics**

The third equation is the result of division the first equation by the second equation
*Thursday, May 24, 2012 at 4:38pm by Elena*

**chemistry**

I looked only at #1. Seven prolems per post is six too many. Do you have any idea how long it takes to work and type in the answers? Too long. Most volunteers will not tackle one that takes that long to answer. If you will note, equation 1 reversed + equation 2 times 3/2 will ...
*Monday, July 5, 2010 at 7:40pm by DrBob222*

**algebra**

Equation Two expressions set equal to each other. Linear Equation in One Variable An equation that can be written in the form ax + b = c where a, b, and c are constants. Note that the exponent (definition found in Tutorial 4: Introduction to Variable Expressions and Equations...
*Wednesday, October 22, 2008 at 7:55pm by Anonymous*

**Algebra**

Without parentheses your equation is ambiguous. I will assume that what is intended is x/(x+3) - 3(x-3) = (x^2+9)/(x^2-9) Multiply both sides by (x+3)(x-3), which is the same as x^2-9, and you get x(x-3) -3(x+3) = x^2 +9 x^2 -6x -9 = x^2 + 9 -6x = 18 x = -3 x=0 is not a ...
*Sunday, February 3, 2008 at 1:19pm by drwls*

**Math**

Consider the equation x^2 + 20 = 12x A) draw geometric diagram representing this equation. B) Show how to complete the square geometrically. C) Solve the equation.
*Thursday, April 10, 2008 at 1:57pm by John*

**algebra**

Let x = cost of pencils and y = cost of markers. 12x + 7y = 5.36 8x + 5y = 3.68 Multiply second equation by 1.5. 12x + 7.5y = 5.52 Subtract first equation from modified second equation. .5y = .16 y = .32 Insert value of y into either equation to find x. Then put both values in...
*Wednesday, March 16, 2011 at 11:23am by PsyDAG*

**Math ....urgent help**

Pick any number that will multiply by one of the equations to give the same number as in the other equation. For example, if we multiply equation 1 by 2 we would have -10x-8y=-22. Why did I pick 2 as a multiplier. Because it gives me -10x and 10x agrees with the x in equation ...
*Wednesday, January 7, 2009 at 5:01pm by DrBob222*

**mathematics**

In a mathematical equation, the coefficient is A. the numeric value of the unknown that makes an equation true. B. the term brought from one side of an equation to the other by performing the opposite operation. C. a number or quantity placed before another quantity to ...
*Thursday, May 14, 2009 at 9:50pm by Anonymous*

**algebra**

multiply second equation by 5 and you will get 15x + 10y = -20 which is the same as the first equation. So you are trying to solve an equation with itself. There will be an infinite number of solutions.
*Friday, June 13, 2008 at 2:15pm by Reiny*

**chemistry**

Sorry, I meant to mention that all the Fe in the equation is Fe3+ (maybe that's obvious from the equation...). In which equation is the SCN not balanced? Mine or Kara's? And how did you get to this answer? Thank you so much.
*Sunday, March 29, 2009 at 6:24pm by lholmq*

**10th grade algebra**

Plugging in a value of x lets you compute y, or vice versa. It is the equation of a striaght line. What are you supposed to do with the equation? Turn it into an equation for y?
*Tuesday, September 22, 2009 at 7:58am by drwls*

**Algebra**

SUBSTITUTION: Solve for a variable in one equation and then substitute that value for the variable in the other equation. ELIMINATION: Manipulate an equation so that one variable will be eliminated when you add the equations together. As long as one variable cancels, it doesn'...
*Saturday, April 25, 2009 at 11:50pm by Sam*

**Physics help 2**

I've asked the question "what is the fundamental equation to find the speed of a rocket." That's what I am having problems with because there are more than one. How do I know which one is the preferred equation used? The preferred equation is the one that suits what you are ...
*Tuesday, November 7, 2006 at 5:59pm by tracey*

**algebra**

Is the second line supposed to be 7x + y = -8, or 7x - y = -8? You sweem to have inserted a second equal sign by mistake. Whichever it is, use the second equation to derive an equation for y in terms of x. Then substitute that "y" value into the first equation, and it will be ...
*Tuesday, February 12, 2008 at 9:42pm by drwls*

**Calculus**

The given line is -5x - 5y = 90 or , dividing by -5 x+y = -18 since the new line is parallel to it, its equation differs only in the costant, so let the new equation be x+y = c , but (7,1) lies on it, so 7+1=c = 8 equation: x+y=8 If perpendicular, then the slop must be ...
*Monday, October 8, 2012 at 9:54pm by Reiny*

**Math**

Did I do this problem correctly? Solve the following system by first handling the equation of the two lines: x=(0, 2) y=(-2, 1) x=(0, -1) y=(-3, -2) Equation 1: y= -x1 Equation 2: y=4x/3+2T Is this the correct answer?
*Friday, September 18, 2009 at 8:01pm by B.B.*

**Algebra: please check**

Find the equation of a line that passes through the point (1,2) and has a slope of 1/3. Show how you found the equation. Would the equation be: y-2=1/3(x-1) Do I need to finish this? I am not sure how.
*Tuesday, June 8, 2010 at 12:10am by bart*

**intermediate algebra-check my answer**

y = ax + b m = 3/4 y = 3/4 x + b You need to find b for this equation. Substitute one of the given points into your equation and solve for b. Then use that b value for your equation.
*Tuesday, February 15, 2011 at 7:57pm by helper*

**chemistry 101**

Add equation 1 to the reverse of equation 2 to obtain the reaction you want. dH for the new reaction is dH for equation 1 + the negative dH (which will make is positive) for equation 2.
*Sunday, April 29, 2012 at 2:36pm by DrBob222*

**9th grade**

5x-3y=23...............equation (1) 3x+5y=7.................equation (2) Eq. (1) x 5: 25x-15y=115......Equation (3) Eq. (2) x 3: 9x + 15y=21........Equation (4) Eq (3)+Eq. (4): 34x = 136 (eliminating y) Therefore, x = 4
*Tuesday, March 16, 2010 at 6:50pm by Math?*

**college algerbra**

We can simplify the equation by dividing it by 3 to have: y = (2/3)x - 8/3. From the general equation of a line: y = mx + b where m is the slope. So, from the equation we can clearly see that the slope (m) = 2/3 To find the y-intercept, we need to set x = 0 from the equation. ...
*Thursday, April 16, 2009 at 5:33pm by Michael*

**calculus**

find an equation for the line with the given properties. express the equation in slope-intercept form. containing the pointsP=(-1,1)& Q= (1,-2) What is the equation of the line? y= Find the the equation of a line that is perpendicular to the line y=1/2x+4 and contains the ...
*Tuesday, December 4, 2012 at 8:45pm by spazed out*

**Chem Class**

You don't know what K is but you don't need to know. Equation 2 is the same as equation 1 but multiplied by 2. So the K for equation 2 is K for equation 1 squared; i.e., K12
*Monday, October 25, 2010 at 6:59pm by DrBob222*

**Chemistry**

Take 1/2 equation 1, add to 1/2 equation 3, add to equation 2 to get the equation you want. K for that reaction is (sqrt k1) x (sqrt k3) x k2
*Sunday, March 31, 2013 at 10:54am by DrBob222*

**Chemistry HELP!**

I don't understand the question. What you have written IS (emphasize IS) the word equation. Should you be asking, "What is the chemical equation for the following word equation? or have I missed the point of the whole thing? The BALANCED chemical equation is 2H2O ==> 2H2 + ...
*Tuesday, March 11, 2008 at 4:30pm by DrBob222*

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