Search: substitution method 7x+9y=39

Number of results: 13,987

Calculus
Find the domain of the following function h(x,y) = sqrt(x-9y+5)?
Wednesday, March 9, 2011 at 3:22pm by Z32

algebra
Factor polynomial completely: 9y^2 - 25yz -6z2
Tuesday, March 8, 2011 at 10:54am by Bob

math
Simplify the expression: (x^9y^-4)^6 x^54/y^24 Is this correct?
Thursday, August 26, 2010 at 8:31pm by Hannah

math
Solve by elimination 8x-9y=8.5 7y-2x=-4.5
Sunday, July 11, 2010 at 3:30pm by wendy

MATH
What is the slope of the straight line 3x - 9y = 44
Wednesday, May 19, 2010 at 10:59pm by ASWAT

Algebra
How do I find the slope and the y-intercept of the line: 10x=9y+45?
Sunday, March 1, 2009 at 9:48pm by A.W.

Algebra
How do I find the slope and the y-intercept of the line: 10x=9y+45?
Sunday, March 1, 2009 at 9:42pm by A.W.

Alg2
Rationalize the demoninator of each expression. (9y/x)^4 i have no idea how to do that
Monday, February 9, 2009 at 10:40pm by Chopsticks

math studies
Find m and a: 12x + 3y = 36 mx - 9y = a
Tuesday, October 21, 2008 at 7:20pm by ll

College Algebra
add the equations: 7x-7y-7y-7x=-42-42 -14y=-84 solve for y. then put that into either equation, solve for x. the equations are independent, and consistent. You need to review those definitions.
Wednesday, November 18, 2009 at 9:40pm by bobpursley

math
For this problem, the distributive property is a must. It states that... a(b+c) = ab + ac For example, 3(9+2) = (3)(9) + (3)(2) = 27 + 6 = 33 Usually, we would just do 3(11) = 33, but that is just an example. 7(x+4) = 7x + (7)(4) = 7x + 28 Try to do that in your problem, and ...
Thursday, November 15, 2007 at 7:15pm by Michael

math
(7x + 4)(2x + 4) Use FOIL-First, Outer, Inner, Last First-7x * 2x = 14x^2 Outer-7x * 4 = 28x Inner-4 * 2x = 8x Last-4 * 4 = 16 Put together, 14x^2 + 28x + 8x + 16 Combine like terms, 14x^2 + 28x + 8x + 16 14x^2 + 36x + 16 All the problems you have posted are done the same way...
Sunday, February 13, 2011 at 7:33pm by helper

math/ratios
number of girls --- 7x numbero boys ---- 4x 7x + 4x = 77 11x = 77 x= 7 so we have 49 girls and 28 boys
Monday, March 18, 2013 at 11:13pm by Reiny

Math
414/7 = x/16 7x = 414(16) 7x = 6624 x = 6624/7 x = 926.29 but I wonder did you mean 4.14 in which case the answer would be 9.29
Monday, November 12, 2012 at 7:16pm by Angel

algebra
10/13. To get an equivalent expression, we multiply the numerator and denominator by the same number. In this case, our denominator went from 13 to 39. 39 / 13 = 3. So we multiplied our denominator by 3. So, we must multiply our numerator by 3 also. Our equivalent fraction is ...
Sunday, November 14, 2010 at 6:21pm by Henry

Math
If you mean 8√48 / √112x √48 = √(16*3) = √16 √3 = 4√3 √112 = √(16*7) = √16 √7 = 4√7 8√48/√112x = 8*4√3/4√7x = 8&#...
Tuesday, February 28, 2012 at 10:26am by Steve

english
Identify a serious error you find challenging to overcome in your own writing. What method will you use to avoid this error? Would you recommend the method to others? Why or why not?
Wednesday, July 18, 2012 at 10:46am by ann

Kinesiology
Assume that a muscle is having a force of 300N is pulling at an angle of 75 degrees. What are the components of the force both the trigonometric method and graphic method.
Monday, February 21, 2011 at 7:45pm by Jon

MaTh = Algebra = help
Solve this system of linear equaiton by an algebraic method. So If I had to solve this the elimination method way, how would I do it? x-2y = 10 3x-y = 0
Monday, January 17, 2011 at 8:51pm by Rihanna

Psychology
What disciplines can YOU envision using the scientific method? In my workplace, a public school, we used the scientific method to decide how best to teach each student.
Sunday, October 25, 2009 at 8:37pm by Ms. Sue

PhYs...alpha particles
Yes, but in the experimental method you are generating the data from scratch, more or less, and in the pencil and paper method you are using data that is already available.
Sunday, February 17, 2008 at 8:04pm by DrBob222

Math
5x + 4x^2 cannot be combined 7x^3 -2x +x^3 -5x = 8x^3 -7x (some terms were combined) 3xy +2y cannot be combined. You can only combine terms that contain x and other variables raised to the same power(s). Constants can also be combined.
Sunday, August 29, 2010 at 6:53am by drwls

chemistry
2X + 2H20 = 2XOH + H2 So two moles of X reacts with water to produce 1 mole of hydrogen. Let R = relative atomic weight of the alkali metal. 1.020 l /22.4 l = 3.5 g /2R R=(3.55/2)*22.4/1.02 =39.0 The alkali metal with a RAM closest to 39.0 is.....
Monday, December 6, 2010 at 8:32pm by MathMate

Kim what about this one?Can you please help me wit
Thanks,what abou this one? Use the Substitution method to solve the system of equations. x + y = 10 y = x + 8 follow the same principle for the first one and u'll get it u already have y = x + 8 Subst. that in the first eqn and just follow up from there CAn you just help ...
Thursday, November 2, 2006 at 7:18pm by Margie

Math
They want you to do it two ways. The first is to change it to dx/[2(1+x)] + dx/[2(1-x)] which integrates to (1/2)[ln(1+x) - ln(1-x)] = (1/2)ln[(1+x)/(1-x)] In the substitution method, with x = sin u dx = cos u du Integral dx/(1-x^2)= cos u du/1-sin^2u = Integral du/cos u = ...
Monday, February 25, 2008 at 3:52am by drwls

math
12 – 8 (3x – 5) > -7x + 29 12 – 24x + 40 > -7x + 29 24x -7x > 12 + 40 – 29 17x > 23 X > 23/17
Tuesday, July 19, 2011 at 8:44am by Mithra

ALGEBRA
Thank you! I actually have another problem that i solved. For this one I need to use the multiplication principle. 7x (greater then or equal to symbol)-6. What I did was divide by 7x on both sides and came up with a decimal of 0.857. I would rather leave it in fraction form at...
Thursday, November 4, 2010 at 4:35pm by Jessica 2

Math
total of hands = C(52,5) = 2598960 at least 4 hearts ---> 4 hearts or 5 hearts prob(at least 4 hearts) = ( C(39,1)*C(13,4) + C(39,0)*C(13,5) )/2568960 = .011224489 or = .011224 correct to 6 decimals
Sunday, May 5, 2013 at 10:18am by Reiny

Physics
After covering 39 m the velocity of the brick was v=sqrt(2gH) = sqrt(2•9.8•39) =27.65 m/s. The brick has to cover the distance 54-39 -2 =13 m. h =vt+gt²/2 gt²+vt-2H = 0 9.8• t²+27.65•t -26 = 0 t =-27.65 ±sqrt(27.65&#178...
Thursday, October 4, 2012 at 9:13pm by Elena

Chemistry
If the molar volume of a gas is 22.42L, what volume will 39.67 moles of this gas have. My answer, (22.42)(39.67) = 889.4L IS this right? Thanks.
Friday, January 28, 2011 at 11:15pm by Ann

Physics
horizontal (until it hits the ground) U = 50 cos 37 = 39.9 m/s vertical at t = 0 , Vo = 50 sin 37 = 30.1 m/s vertical problem v = Vo - 9.8 t at top, v = 0 0 = 30.1 - 9.8 t so t = 3.07 seconds at top add another 3.07 seconds to fall total time in air = 6.14 seconds horizontal ...
Saturday, November 22, 2008 at 5:37pm by Damon

Am. History
http://www.google.com/search?hl=en&site=&source=hp&q=JFK+missile+crisis+performance+evaluate&oq=JFK+missile+crisis+performance+evaluate&aq=f&aqi=&aql=&gs_l=hp.3...2983.16599.0.17033.39.39.0.0.0.0.153.3850.20j19.39.0...0.0.eUM8112lkvw Read widely...
Sunday, June 10, 2012 at 12:06am by Writeacher

ALGEBRA 3
if f{x}= negative x square - 7x - 22, what is f{negative 5}? a.negative 82 B.NEGATIVE 32 C. 12 D. NEGATIVE 12 Your problem: f(x) = -x^2 - 7x - 22 To find f(-5), substitute -5 for x. Watch your signs. I hope this helps.
Thursday, January 11, 2007 at 7:03pm by Darius Graham

MATHH
(1) 7x - 2y =3 (2) 2x + y = 4 look to see which variable is easier to get rid of. since the first equation has -2y, multiple the 2nd equation by 2, so that you get 2y. -2y + 2y = 0, so you will have eliminated the y variable Multiple (2) by 2 2 (2x + y = 4) = 4x + 2y = 8 Add ...
Thursday, January 13, 2011 at 8:17pm by helper

math
4. (2X-3)/(4X-1) -Div by (6X^2-13X+6)/ (15X^2-7X-2). Factor trinomial in numerator using A*C Method: A*C = 6*6 = 36 = -4*-9, 6X^2 -4X-9X +6 Group the 4 terms in pairs and factor each pair: 2X(3X-2) -3(3X-2). Factor out (3x-2): (3X-2) (2X-3). Factor the trinomial in denominator...
Wednesday, August 4, 2010 at 9:46am by Henry

math
While 1cm = 0.39 inch is a good approximation to within 1%, I usually use one inch = 2.54 cm, which is exact! Using the given conversion factor, 50 cm = 50cm *0.39"/cm = 19.5" 75 cm = 75cm *0.39"/cm = 29.25" Using the exact value of 1"=2.54cm, 50 cm = ...
Tuesday, March 15, 2011 at 7:45pm by MathMate

calc
find the volume of the solid generated by revolving around the x-axis: y=e^(x-8), y=0, x=0, x=10 So I know you can use the washer method, but the shell method can also be used and it should be better. The issue is I'm not certain how to actually do it. Any help is ...
Tuesday, January 29, 2013 at 11:10pm by Anonymous

statistics/calculus
You can certainly solve for x without a TI-89, but you will need to use some kind of iterative method. Judging by the shape of the curve, Newton's method should converge quite rapidly.
Thursday, September 27, 2012 at 10:18pm by Steve

Math
The methods are obviously vry different, but should arrive at the same answer. You don't have to plot a graph to use the algebraic method. On the other hand, the graphical method will always produce a result.
Wednesday, March 10, 2010 at 6:00pm by drwls

Personal Finance
If the interest is figured on the balance at the end of each year, then you can do it this way. $33,000 * 0.1 = $3300 At the end of the first year there'll be $36,300. 36,300 * 0.1 = $3630 End of 2nd year = $39,930 You can continue using this method for each year. Add the ...
Saturday, February 16, 2008 at 1:05pm by Ms. Sue

Is Tallahassee the midpoint of Pensacola and St. A
Yes! we can set up the equation 3x+40+4x+5=395 and solve to get 7x+45=395 7x=350 so x=50 When we plug it in to check, we get 3(50)+40+4(50)+5=395 so the answer must be correct!
Tuesday, August 7, 2007 at 11:01am by Kim

Grade 11th Maths
This problem is related to Chapter-Sets. Please solve the question using x method. x method means x ∈ A ∩ B Q. If A-B=A then show that A∩B=Ø
Tuesday, June 29, 2010 at 7:11am by Akash

math
One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number. This is what I have so far: x+y+12=39
Sunday, November 25, 2007 at 10:39pm by Word Problem

math
39.95-19.95=20 .39-.29=.10 20/.10=200m
Thursday, April 11, 2013 at 9:23am by gngraqn

Algebra help/ look over please
Can you please look over these and let me know if they are right? 1/4(5x-1/2)-5/3<1/3 5/4x-1/8-5/3<1/3 24(5/4x-1/8-5/3)<24(1/3) 30x-3-40<8 30x-43+43<8+43 30x<51 x<51/30 {x|x<51/30} 31-(2x+2)< or equal to 4(x+1)+x ...
Thursday, October 1, 2009 at 2:25pm by Lisa

mat116
Can you please look over these and let me know if they are right? 1/4(5x-1/2)-5/3<1/3 I got {x|x<51/30} 31-(2x+2)< or equal to 4(x+1)+x I got {x|x>equal to 3.6} Use elimination method: 4x+5y=-12 and 7x-5y=-76 I got x=-8 and y=4 elimination: 0.3x-0....
Thursday, October 1, 2009 at 12:26pm by Anonymous

FIFO METHOD
COULD U SHED SOME LIGHT OFN FIFO METHOD
Friday, July 30, 2010 at 10:18pm by NOAH

math
This looks like a question posted earlier today, except in this case 7x + 15 has replaced 7x - 15. Add up all angles, set the sum equal to 180, and solve for x. Then compute the angles and decide what kind of triangle it is. This time it WILL be one of the 4 choices. Last time...
Friday, May 30, 2008 at 11:38pm by drwls

maths
What is the centre of the equation 4x^2 9y^2 - 32x 36y 11
Saturday, December 15, 2012 at 5:39am by Minte

algebra
Do you mean 4x^9y-9? Please check and clarify your expressions.
Wednesday, August 22, 2012 at 3:40pm by Henry

Math
The slope and y-intercept of the relation represented by the equation 12x – 9y + 2 = 0 are
Sunday, May 27, 2012 at 3:54pm by clary

Algebra
Solve.Show work. -9y-12(2-3y)=-25-2(y+6)
Saturday, March 17, 2012 at 3:38pm by sherry

algebra
5x-9y=113x+7y=19.......plz help serious..........
Thursday, March 8, 2012 at 9:50pm by Destiny

Algebra
Reading more carefully, 4/vy^2 + 9/yv^2 = (4v+9y)/v^y^2
Tuesday, October 25, 2011 at 10:01pm by Steve

Algebra
solve equations by elimination 2x-6y=3 (1) 4x+9y=-1 (2)
Friday, September 16, 2011 at 3:20am by Al

intermediate algebra
compleletly factor the following expression 9y^2-16z^2
Tuesday, July 26, 2011 at 11:25pm by ROCKY

math
how would i solve 2x+9y=33 x=19-5y
Saturday, July 23, 2011 at 4:13pm by conswella

Pre-Algebra
Find any numbers for which each rational expressionis undefined. 9y^5+y^3/9
Thursday, March 31, 2011 at 6:27pm by Nancy

algebra
Factorise the expressions 9y^2-25 x^2-x-12 I'm totally stuck!
Tuesday, March 8, 2011 at 6:10am by Marian

Math(Please help)
Simplify the expression: (x^9y^-4)^6 x^54/y^24 Is this correct?
Thursday, August 26, 2010 at 8:57pm by Hannah

math
rewrite the division into a multiplication 9y+14/66
Friday, September 18, 2009 at 10:41pm by Anonymous

math
how do you find the differential equation for t(dy/dt)+9y=8t and y(1)=6?
Thursday, January 29, 2009 at 11:31pm by alice

math
(-4,6);4x=9y+7 the equation of the line is y= need some help here.
Saturday, November 1, 2008 at 10:09pm by mikey123

algebra
what are the restricted values of y for the rational expression to be defined: 2y-3/9y+7
Thursday, August 21, 2008 at 10:36pm by nicky

Algebra
Factor completely: x^10y^3 – 4x^9y^2 – 21x^8y
Tuesday, August 12, 2008 at 4:13pm by JoAnn

Math
How do you do questions like this: -9y-12=93 I need to know the steps as well.
Sunday, May 4, 2008 at 2:30pm by Alyssa

homework hlep
3x- 5y/(7 ) = 10 2x/3 - 9y/7 = 19/5
Sunday, November 11, 2007 at 6:41pm by marie

chemistry
In the first trial, was at least a drop of the liquid present when P was 39.9 kPa? If so then that is the vapor pressure of the liquid at that temperature and the pressure in the second trial will be 39.9 kPa.
Tuesday, November 8, 2011 at 12:11am by DrBob222

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

physics
The total kinetic energy is the sum of Translational KE = (1/2)MV^2 = 39.5 V^2, and Rotational KE = 2*(1/2)*I*w^2 = I*V^2/R^2 = 0.978 V^2 I is the moment of inertia of a single wheel. The fraction of the energy that is rotational is 0.978V^2/(0.978+39.5)V^2 = 0.0243 Note that ...
Tuesday, July 10, 2012 at 5:23pm by drwls

Statistics
P(x)=.10 "at most" means "binomialCDF" on calculator. 1 student is upper value, 0 is lower value. n=20 or number of trials. ANSWER: CDF=.39 or ~39% that at most one student is left handed in a class of 20 students.
Friday, December 9, 2011 at 8:33pm by Andrew

physics
A cable lifts a 1220-kg elevator at a constant velocity for a distance of 39.7 m. What is the work done by the tension in the cable? can someone help me with this the answer is supposed to be in joules i tried doing it by 1220(9.81)(39.7) = 475137J but that is not the answer ...
Sunday, November 27, 2011 at 11:04pm by Yuli

MATH PLEASEEEEE
for (f+g)(x) you would add up your two function expressions and simplify them so (f+g)(x) = x/2 + 3x+1 = x/2 + (6x+2)/2 = (7x+2)/2 which is not what you have suppose we use x=4 f(4)= 4/2 =2 g(4) = 13 so (f+g)(4) = 15 in my (f+g)(x) = (7x+2)/2 (f+g)(4) = (7(4)+2)/2 = 15 for (f-...
Tuesday, December 16, 2008 at 5:38pm by Reiny

Algebra/Elimination method
Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. -27x - 18y = -180 9x + 6y = 60
Tuesday, May 24, 2011 at 5:32pm by Kelli

Algebra
Solve by elimination method. 7r-3s=14 3r+7s=64 Could never figure out the elimination method. Would love some help with this one. Thanks
Tuesday, December 7, 2010 at 8:36am by Christina

Grade 11th Maths
This problem is related to Chapter-Sets. Please solve the question using x method. x method means x ∈ A ∩ B Q. If A⊂B, then prove that B'⊂A'
Tuesday, June 29, 2010 at 7:09am by Akash

College Math II
Solve by any method. a^4 – 5a^2 + 4 = 0 I am having problems figuring out what method to use to solve this problem. I need to show my steps and I am not sure how to do this. Can someone help? Thanks.
Saturday, November 21, 2009 at 11:51am by Lori

physics
You pull your little sister across a flat snowy field on a sled. Your sister plus the sled have a mass of 39 kg. The rope is at an angle of 39 degrees to the ground. As you pull with a force of 31 N, the sled travels a distance of 47 m.
Wednesday, October 5, 2011 at 9:47am by bryce tanaka

algebra
60=(x-1)(x-6)(x-2) 60=(x^2-7x+6)(x-2) 60=(x^3-2x^2-7x^2+14x+6x-12) x^3-9x^2+20x-72=0 Hmmmm. Ok, graph this equation, find where it crosses the x axis, I see x=7.59 which makes lwh then 6.59;1.59;5.59 check 6.59*1.59*5.59=
Monday, May 16, 2011 at 4:23pm by bobpursley

Please help quick! Maths
To do substitution method, we choose an equation and express one of the variables in terms of the other, and finally substitute this to the other equation. In this case, let's choose the first given equation and express x in terms of y: x - 2y - 5 = 0 x = 2y + 5 then we ...
Sunday, August 26, 2012 at 9:57am by Jai

algebra
On paper, this is how I would expect students to do this x/9 = 1/7 = 26/63 multiply each side by 63, the LCD 63(x/9) - 63(1/7) = 63(26/63) 7x - 9 = 26 7x = 35 x = 5
Friday, March 1, 2013 at 2:59pm by Reiny

math
x+y=7 4.5x+6.5y=39.5 Multiply the top equation by -4.5 to cancel the x's: -4.5x-4.5y=-31.5 4.5x+6.5y=39.5 2y=8 y=4 Put that back in the first equation to solve for x.
Thursday, September 2, 2010 at 12:14pm by Jen

Math
The .39c a pound sign is a . for the dollars as well as a c for the cents. $.39 would be correct OR 39 c would be correct. The second sign does the same. It would be correct to list it as 102 c OR $1.02
Tuesday, November 13, 2007 at 9:19pm by DrBob222

algebra 2
for (2) y = -7x - 53 sub into (1) 3x + 7(-7x-53) = -3 3x - 49x - 371 = -3 -46x = 368 x = -8 sub that back into y = .... to get y
Thursday, February 17, 2011 at 8:17pm by Reiny

substitution method
1.8X + 6Y = 8 2. -9X + Y = 22 Using Eq. 2, solve for y. Y = 9X + 22 Substitute 9X + 22 for y in Eq 1: 8X +6(9X + 22) = 8. Solve for X: 8X + 54X + 132 = 8 X = -2. In Eq. 2,substitute -2 for X and solve for Y: -9(-2) + Y = 22, Y = 4 Solution: X = -2, and Y = 4.
Tuesday, July 20, 2010 at 12:45pm by Henry

Math
i got it!!! but im not sure if its right. plz correct if wrong!!!thnx. a) 47,962.20/26=1844.70/2(39)=$23.65/hrs b) 23.65*39+1.5*23.65*10=$1,277.10
Friday, January 29, 2010 at 7:40pm by help!

Simple Rate of Return
17.Pid has invested in a machine that cost $70,000, that has a useful life of seven years, and that has no salvage value at the end of its useful life. The machine is being depreciated by the straight-line method, based on its useful life. It will have a payback period of four...
Wednesday, December 13, 2006 at 4:58pm by Help!!!

algebra
This is the substitution method y-2x=8 (1) 2y+x=1 (2) From equation (1) y-2x=8 would now be y=8+2x you can call this equation (3) so now, we substitute equation (3) in equation (2) 2(8+2x)+x=1 16+4x+x=1 16+5x=1 5x=1-16 5x=-15 x=-15/5 x=-3 for x=-3, substitute it in equation (3...
Wednesday, February 17, 2010 at 12:17pm by Ren

math
List advantages and disadvantages comparing and contrasting solving systems of linear equations with two variables by graphing and by equation method. Explain which method you prefer and why. Support your answer by providing appropriate examples
Friday, December 17, 2010 at 7:39pm by Anonymous

Math
Write these in factored form? 12 +6x x+x+x+6 x^2 + 3x x^2 + 4x +3 Combine like terms? 3x + 4x 11 + 5 + 2x + 6x 3x -2 - x + 9 7x - 8 - 11x x^2 + 2 + 7x + 4 - x x + 5x + x^2 + 3 + 2x^2 I don't really understand it so if you could help me, thaanks c:
Tuesday, April 10, 2012 at 9:13pm by Mika

algebra
Let the largest number be 7x. (x will have to be an integer; otherwise the three numbers cannot be integers) The sum of the first and second numbers is then 8x. 7x * 3 = 21x = 8x + 26 13x = 26 x = 2 The three numbers are 6,10, and 14.
Saturday, December 31, 2011 at 12:49pm by drwls

Math
0.9x+9 ≤ 1.7x-8 Isolate variable x on the left, and constants on the right: 0.9x - 1.7x ≤ -8 -9 -0.8x ≤ -17 divide each side by -0.8 (and change the direction of the inequality) x ≥ 17/0.8 x ≥ 21.25
Friday, August 20, 2010 at 8:04pm by MathMate

Math
2(2x+7)+(3x-5)=37 4x + 14 + 3x - 5 = 37 7x + 9 = 37 7x = 28 x = 28/7 = 4
Monday, October 22, 2012 at 6:43pm by Ms. Sue

maths
9x+1=13+7x 9x - 7x = 13 - 1 2x = 12 x = 12/2 x = 6
Monday, May 30, 2011 at 5:59pm by Ms. Sue

Math
Is this 3x+23=7x? Or is there a sign between the 7 and x? If it's 3x+23=7x.. 23=4x 23/4=x
Wednesday, September 29, 2010 at 2:00pm by Jen

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