Saturday
April 19, 2014

Search: substitution method 7x+9y=39

Number of results: 15,808

trigonometry
-x^2-7x=-11 x^2 - 7x = 11 x^2 - 7x + 49/4 = 11 + 49/4 (x - 7/2)^2 = 44/4 + 49/4 x - 7/2 = √93/2 x = (7 √93)/2
Thursday, November 12, 2009 at 10:15pm by Reiny

math
-7(1-4m)=13(2m-3) -7+28m=26m-39 -26m -7+2m=-39 -7 2m=-46 m=-23 am i right?
Wednesday, January 12, 2011 at 6:29pm by bella

school of engineering
i. Acceleration is the change in velocity over time. a = (v,f - v,o) / t where v,f and v,o are the final and initial velocities respectively, and t is the time. Substituting, a = (100 - 50 km/h)*(1000 m / 1 km)*(1 h / 3600 s) / 10 s a = 1.39 m/s^2 ii. Since the motion is ...
Tuesday, October 15, 2013 at 6:59am by Jai

Math
by the product rule .... f ' (x) = x^(4/5) (2)(x-6) + (4/5)x^(-1/5) (x-6)^2 = (-1/5)x^(-1/5) (x-6) [10x + 4(x-6) ] = (-2/5)x^(-1/5) (x-6) (7x-12) = 0 for critical numbers (max,min) -1/5x^(-1/5) = 0 ---> no solution x-6 = 0 ---> x = 6 7x-12=0 ---> x = 12/7 take it from...
Saturday, November 10, 2012 at 2:29am by Reiny

algebra
2y squared + 2 = 9y
Tuesday, August 28, 2007 at 9:35pm by anonymous

equations
whats 6y+9y if y=5
Thursday, September 27, 2007 at 3:29pm by diamond

Algebra
125x^9y^12z^3
Wednesday, April 7, 2010 at 10:39pm by Reiny

algebra
No way. y/4 + 2y = 9y/4
Thursday, May 20, 2010 at 12:15am by drwls

math
Factor: x^8 + 2x^4 y^4 + 9y^8
Saturday, August 7, 2010 at 1:09am by cosca

Math
2 (2xy + 6 xy + 9y) 2(8 x y + 9 y) 2 y (8 x + 9)
Monday, January 10, 2011 at 9:05am by Damon

math
1. 9y^2 + 24yx + 16x^2
Tuesday, January 24, 2012 at 2:33pm by Jordan

algebra
x^2 +4x +9y^2 -36y +4=0
Sunday, April 29, 2012 at 1:13pm by bill

Math
x^2 + 9y^2 = 37 x - 2y = -3
Tuesday, December 11, 2012 at 8:46am by Princess

Math
x^2 + 9y^2 = 37 x - 2y = -3
Tuesday, December 11, 2012 at 11:07am by Princess

math
14=2/3(9y-15)
Monday, February 18, 2013 at 8:43pm by katie

maths
y-(7-8y)/9y-(3+4y)=2/3
Thursday, June 20, 2013 at 10:07am by jennath

algebra
Evaluate 8-9y for y =10
Monday, October 14, 2013 at 3:50pm by Anonymous

Math
1.9x-1.9y=3.8 (graph)
Monday, March 3, 2014 at 8:29pm by Someone

Math
What are the intercepts for 1.9x-1.9y=3.8
Monday, March 3, 2014 at 8:38pm by Someone

algebra
(3x-39)/2x = 1 + 50/2x 3x-39 = 2x + 50 x = 89 Check: 3*89-39 = 228 228/178 = 1 R 50
Monday, February 25, 2013 at 11:28am by Steve

Algebra
Aki's Bicycle Design has determined that when x hundred bicycles are built, the average cost per bicycle =0.9x^2-1.7x+10.861, when C(x) is in hundreds of dollars. How many bicycles should the shop build to minimize the average cost per bicycle? C(x)=0.9x^2-1.7x+10.861 = C(x)=0...
Thursday, March 6, 2008 at 10:23am by Becky

algebra
Y = -1.7x + 8.5. 1. Gather all variables to the left side of the Eq and gather the constant to the rt. side. 1.7x+ Y = 8.5. 2. Multiply both sides by 10 to eliminate all decimals. 17x + 10y = 85.
Monday, September 10, 2012 at 10:28am by Henry

8th grade
7x + 12x -9 - 4x -3 Combine like terms 7x + 12x -4x = 15x 15x - 12
Wednesday, April 22, 2009 at 10:31pm by Ms. Sue

Mathmatics
7x=x+18 You need to get the unknowns on one side of the equation and the known on the other side. 7x - x = x - x + 18 6x = 18 x = 18/6 = 3
Wednesday, November 4, 2009 at 6:16pm by Ms. Sue

algebra
4(3x)-4(3)+4(5y)-(4)(7x)+3y combine like terms: [4(3x)-(4)(7x)]+ [4(5y)+3y]+[-4(3)] now simplify it further.
Sunday, September 19, 2010 at 8:27pm by TutorCat

math
7(x-2)=50 7x - 14 = 50 7x = 64 x = 64/7 x = ?
Friday, July 23, 2010 at 8:23pm by Ms. Sue

math
5x + 11 = 7x + 3 11 - 3 = 7x - 5x 8 = 2x 4 = x
Wednesday, July 18, 2012 at 9:47pm by Ms. Sue

Algebra 1
Add (5x^2 - 2x + 9) + (2x^2 - 4). My answer: 7x^4 - 2x + 5 or 7x^2 - 2x + 5?
Friday, February 21, 2014 at 4:45pm by Anonymous

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 AUB=, then prove that A=,B=
Tuesday, June 29, 2010 at 7:12am by Akash

biology
I did a lab with catalase breaking down hydrogen peroxide. A question asks, what gas is being formed (oxygen), suggest a method I could use to determine this. I don't know any method?
Thursday, June 9, 2011 at 9:54pm by Tone

algebra
Ticket Prices Two hundred tickets were sold for a baseball game, which amounted to $840. Student tickets cost $3, and adult tickets cost $5. (a) Let x be the number of student tickets sold and y be the number of adult tickets sold. Write a system of linear equations whose ...
Monday, February 27, 2012 at 3:21am by kay

Math
2x-5=39 2x=39-5 2x=34 x=17
Tuesday, January 29, 2013 at 6:16pm by Tom

Math
2x-5=39 2x=39+5 2x=44 x=22
Tuesday, January 29, 2013 at 6:16pm by Eric

Algebra
40 =15 x x - 20 This is a three part question>> first find the lcd method of solving this equations, and the second ones about cross-multiplying method to solve this equations ,The next question asked would the cross- multiplying method work for all rational equations?? ...
Sunday, December 4, 2011 at 8:49pm by JERSEYGIRL

Physic
D = 55m@90o + 46m@30o,CCW from 0. X = 46*cos30 = 39.84 m.. Y = 55 + 46*sin30 = 78 m. D^2 = (39.84)^2 + (78)^2 = 7671.2 D = 87.6 m.
Tuesday, August 28, 2012 at 12:08pm by Henry

College Physics
A monatomic ideal gas is compressed adiabatically from a pressure of 1.39 105 Pa and volume of 260 L to a volume of 39.0 L. What is the new pressure of the gas?
Tuesday, December 6, 2011 at 7:21pm by John

Managerial Accounting
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...
Thursday, December 14, 2006 at 10:15am by Dovey

Accounting
In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ...
Sunday, February 26, 2012 at 6:38pm by Casey

Accounting
In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ...
Monday, February 27, 2012 at 12:15am by Casey

Accounting
In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ...
Monday, February 27, 2012 at 4:04pm by Casey

Algebra question
When you solve a system of equations by the substitution method, how do you determine whether the system of equations is dependent? If your variables disappear as you simplify, and you end up with 0=0 (or k=k) the system is dependent. (really just the same line, one equation ...
Tuesday, August 14, 2007 at 6:52am by Nik

calculus
Use Newton's method to solve the equation sec x = 4 in the interval x in (0, pi/2). In other words, use Newton's Method to compute arcsec(4). (You need to make a good initial guess for the root otherwise Newton's method will probably fail. Please justify how you came up with ...
Wednesday, April 13, 2011 at 7:42pm by Anonymous

calculus
The ellipse x^2+3y^3=13, has two points when x+-1 . Find the slope of the ellipse at both these points. 2. Thoroughly explain the method you used to find the slope in part 1. What are the strengths and weaknesses of the method you used? 3. Explain whether your method will work...
Thursday, January 3, 2013 at 10:55pm by erika

math
11.3 revs/39 sec = 11.3(2π)radians / 39 seconds = (113/195)π radians/s or appr 1.82 rad/s
Sunday, February 19, 2012 at 5:10pm by Reiny

Math
Why could the mean of the data set below be misleading? ages of teachers: 29, 38, 39, 26, 29, 29, 39, 77, 38, 29
Tuesday, October 9, 2012 at 2:39pm by Missy

statistics
What z-score values form the boundaries for the middle 60% of a normal distribution? a. z = +0.25 and z = 0.25 b. z = +0.39 and z = 0.39 c. z = +0.52 and z = 0.52 d. z = +0.84 and z = 0.84
Sunday, October 14, 2012 at 12:08am by Robbie

Math
Let one angel be x let its complementary angle by 90-x 2x-27 = 90-x 3x = 117 x = 39 one angle is 39 , the other is 51
Thursday, November 15, 2012 at 8:06pm by Reiny

Math help 2
And this one is troubling me. 3x^0 - 2(x - 3^0) - |-11 - 2| = 4x(2-5^0) - 7x please help. Thanks I don't know if you are aware of this, but anything to the "zero power" = 1 and the vertical lines indicate absolute value (regardless of sign). So this translates to: 1 - 2(x - 1...
Thursday, June 22, 2006 at 11:12am by Steven

math
It is importnt that you attempt these problems yourself. use the rule that (a+b)(c+d) = a(c+d) + b(c+d) =ac + ad + bc + bd. In other words, add up all the possible pairs of products from each of the two terms in parentheses. In the first case, the answer is 7x^3 + 7x + x^2 + 1...
Friday, March 7, 2008 at 9:40am by drwls

Math
you can use a substraction-or-addition method or substitude method. So... x+y=21 you multiply both side by 3 3x+3y=63 3x+4y=21 --------- then you eliminate one variable you use the subtraction method -y=42 y=-42 then you solve for x by substituting the y x+(-42)=21 x=63
Tuesday, February 26, 2008 at 9:10pm by Vanessa

Calculus please help
I have 3 calc problems that i have not been able to do please help me... i've been on here yesterday as well but no one was able to assist me with these particular ones... 1. If f(x)=5x^32/x-4 find f'(x)____ what i got was (4x^2+7x-12)/x^8 2. The position function of a ...
Sunday, April 27, 2008 at 8:30pm by John

college algebra
for the x-intercept let y = 0 x^3 + 7x^2 + 10x = 0 x(x^2 + 7x + 10) = 0 x(x+2)(x+5) = 0 so x = 0, -2, -5 (your x-intercepts) for the y-intercept, let x = 0 then of course y=0 so 3 x-intercepts, one y-intercept
Wednesday, April 1, 2009 at 10:38am by Reiny

Math
from dy/dx = 4x + 7x y = 2x^2 + 7x + c but 4x+7 = 5 4x = -2 x = -1/2 sub into y = 2x y = 2(-1/2) = -1 so P is (-1/2, -1)
Sunday, April 7, 2013 at 6:11pm by Reiny

Calculus
u = 13-7x u' = -7 y = u^-1/2 y' = -1/2 * u^-3/2 * u' = 7/[2 * (13-7x)^3/2]
Sunday, October 2, 2011 at 1:47pm by Steve

Science
I think it is potassium (19). Potassium is in group 1 with sodium therefore it has similar properties and it has an atomic weight of 39.0983 where as argon (18) has an atomic weight of 39.948.
Thursday, February 24, 2011 at 10:29pm by Nursing Student

physics!
in the frame of the car, the ball comes in with 39 m/s speed, and bounces back at 39 m/s in the other direction. In the observer frame we need to add the 18 m/s relative speed of the car, and get 57 m/s
Friday, March 23, 2012 at 4:36am by Philip

math
3x + 7(x-2)-13 = 12 -3x = 3x +7x-14-13 = 12-3x 10x-27=12-3x 13x-27=12 13x=39 x=3 Check: 3(3)+7(3-2)-13 = 12-3(3) 9+7-13=12-9 3=3 Correct.... Hope this helps!
Saturday, October 24, 2009 at 5:49pm by Suchindram

algebra
(3x-39)/2x = 1, Re = 50. Quotient*Divisor + Re = Dividend. 1*2x + 50 = 3x-39 2x-3x = -39-50 = -89 -x = -89 X = 89.
Monday, February 25, 2013 at 1:25am by Henry

geometry
This only makes sense if (7x-27)(4x+12) = 0 "of each variable" ? There is only one variable then 7x-27=0 or 4x+12=0 7x = 27 or 4x = -12 x = 27/7 or x = -3
Sunday, September 16, 2012 at 8:13pm by Reiny

Chemistry
a mole of any chemical is its atomic or molecular mass in grams. a mole of K is 39.0983 grma Moles of K in 25 g= 25/39.0983
Saturday, October 23, 2010 at 9:57am by bobpursley

Math
V = (4pi/3)r^3 = 52pi cm^3. Divide both sides by 4pi/3: r^3 = 39, r = 3.39cm = a side of cube, V = (3.39)^3 = 39cm^3 = volume of cube.
Monday, May 30, 2011 at 10:33am by Henry

math
Ms.Sue: dont understand question JL:37-2=39,then-59=10 same as (37+-2=39)-59=10
Tuesday, January 31, 2012 at 7:13pm by Kennedy

calculus
y'=3x^2-16x-7 y=mx+b y=(3x^2-16x-7)x+b on the line. b=o, as it goes thru origin. y=x^3-8x^2-7x on the curve, so, where are x,y the same on the line and curve. Y line=ycurve 3x^3-16x^2-7x=x^3-8x^2-7x 2x^3-8x=0 2x(x^2-4)=0 x=0, x=+-2 so you have these points for x, figure y at ...
Saturday, November 5, 2011 at 9:13pm by bobpursley

finance charges
Calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded, and that the month is 30 days long. (Round your answers to the nearest cent.) $500 balance, 17%, $50 payment (a) previous balance ...
Saturday, November 16, 2013 at 12:55pm by Anonymous

algebra
You can set up the equations as follows: B=5A C=4A-9 A+B+C=180 (sum of angles of a triangle). and solve for A, B and C. However, you can easily solve it by substitution into the third equation: A+B+C=180 A + 5A + 4A-9 = 180 10A=189 A=18.9 With A known, you can then find the ...
Friday, February 17, 2012 at 5:52pm by MathMate

VERY URGENT MATH!!!
1. 3w 10w (1 point) 13w 7w 7 7w 2. y + 2y +3z (1 point) 2y + 3z 3y + 3z 2y2 + 3z 6yz 3. 6r + r 5r (1 point) 2r 1r + r 0r 7r 5r 4. 5x + 2(x + 6) (1 point) 7x + 6 7x2 + 12 7x + 12 7x (x + 6) 5. 3m + 3(m + 6) (1 point) 6 6m + 6 6m + 18 18 MY ANSWERS: 1)B 2)D 3)D 4)A 5)A...
Friday, December 21, 2012 at 8:31pm by Gabby

MAT/116 Algebra
Please do nto piggy back questions as it looks as though the original has been answered. For any straight line equation of the form y=mx+c m is the gradient and (0,c) is the intercept so for f(x)= -7x-3 i.e. f(x)= -7x+-3 the gradient is -7 and the intercept is (0.-3) now try ...
Thursday, January 28, 2010 at 4:20am by Dr Russ

college physics
Vo = 38 m/s @ 20o. Xo = 38*cos20 = 35.71 m/s. Yo = 38*sin20 = 13.0 m/s. Xo * Tr = 39 m. 35.71*Tr = 39 Tr = 1.09 s. = Time to reach 39 meters. h = ho + Yo*Tr + 0.5g*Tr^2. h = 1.5 + (13*1.09 - 4.9(1.090)^2)=9.85 Meters above gnd when it reaches 1st base.
Tuesday, October 30, 2012 at 5:38pm by Henry

PHYSICS
A = 2(180/pi) = 114.59 deg. a = 114.59 deg/s^2. d = Vo + 0.5at^2 d = 0 + 0.5*(114.59)(2.3)^2=303.09 deg. 303.09 + 57.3 = 360.39 deg. P = 360.39 - 360 = 0.39 deg, CCW from x-axis.
Wednesday, July 13, 2011 at 10:56pm by Henry

Finite Math
Discuss the differences between the echelon method and the gauss-jordan method for solving matrix problems? What are the pros and cons of using a calculator or computer to do these calculations?
Sunday, December 13, 2009 at 1:02am by Jennifer

7th grade math help Ms. Sue quick please
1B. 12.99 * 0.2 = 2.60 discount 12.99 - 2.60 = 10.39 new price 10.39 * 0.05 = 0.52 tax 10.39 + 0.52 = 10.91 price for each doll Study how I found that answer. Then try # 2 yourself. I'll be glad to check your work. Hint: the new price of the iPad is around $280.
Tuesday, November 27, 2012 at 6:09pm by Ms. Sue

biology
Make a single base pair substitution mutation in the gene below that results in a protein that is shorter than the protein produce by the original gene. When you are satisfied with your change and its effect, click the "Final Check" button. Note that a "single base pair ...
Monday, November 18, 2013 at 10:19am by juanpro

algebra
Q: find the slope x + 9y = 18 m = ? A: m = - 1/9
Saturday, October 4, 2008 at 7:02pm by Carmen

math
how do you solve 9y^18/15y^2
Tuesday, August 30, 2011 at 8:07pm by bbf

Alg2
whoa wrong equation its (9y/x)^(1/4)
Monday, February 9, 2009 at 10:40pm by Chopsticks

math
x+9y=18 find slope
Wednesday, March 3, 2010 at 8:05pm by josh

math
Factor: x^8 + 2x^4y^4 + 9y^8
Thursday, July 22, 2010 at 6:03am by cosca

math
do you mean this?: (x^(9y^(-4)))^6 if it is, it should be: x^(54/y^4) so there,, =)
Thursday, August 26, 2010 at 8:31pm by jai

Algebra
I did that u get 9y(5-9x)/((x-5)(x+5)) but it is still wrong
Wednesday, September 22, 2010 at 5:10pm by Alex

Algebra
x + 9y=33 5x + 4y =1
Sunday, May 22, 2011 at 4:27pm by Jeannie

Math
(5x-9y+8)-2(3x-7y+5)
Friday, September 9, 2011 at 7:27pm by Henry

Math-Ellipses
then a=3 and b=2 x^2/9 + y^2/4 = 1 or 4x^2 + 9y^2 = 36
Thursday, October 6, 2011 at 9:40pm by Reiny

ALGEBRA
what is -9y-12(2-3y)= -25-2(y+6)
Wednesday, December 7, 2011 at 7:37am by Angela

algebra
18x + 9y ≤ 72
Wednesday, February 8, 2012 at 8:02pm by PsyDAG

math
9y squared + 48 - 36
Sunday, April 1, 2012 at 10:40pm by diana

Math
D^2 Y/DX^2 +9Y = 1/Cos(3x)
Thursday, June 21, 2012 at 3:15am by raam

math
5x-y=22 x+9y=32
Friday, July 6, 2012 at 8:11pm by David

maths
There is addition sign b/n 4x^2 + 9y^2
Saturday, December 15, 2012 at 5:39am by Minte

algebra
8-9y 8 - (9 * 10) = -82
Monday, October 14, 2013 at 3:50pm by Ms. Sue

Math
Please help me!! 1.9x-1.9y=3.8 Pllleeeaaassseee help me !!!
Monday, March 3, 2014 at 8:36pm by Someone

Calculus Help
6x^2 + 9y^2 y' = 0 y' = -2x^2 / 3y^2
Thursday, March 20, 2014 at 3:28pm by Steve

dma 040
The larger angle would be 4 + 7x and the smaller would be x. They both add up to 180, so (x) + (7x + 4) = 180. This is 8x + 4 = 180. 8x = 176. x = 22. The smaller angle is 22. The larger angle is 7x + 4, 7(22) + 4, 154 + 4 = 158 The 2 angles are 158 and 22.
Saturday, September 14, 2013 at 10:48pm by Anonymous

math
Note that the differences grow by one each day. That implies a quadratic relationship. In fact on July nth, the sheep eats n(n+9)/2 carrots. On July 30, that's 30(39)/2 = 15*39 = 585 carrots
Tuesday, January 31, 2012 at 9:41pm by Steve

plumbing
Q: what is the formula, answer and conversion of a 39.8gallon electric hotwater heater and height is 22"width & 48" height and its a cylindrical tank? So were looking for the formula in steps to get the answer which is 39.8 gallons in imperial.
Tuesday, February 28, 2012 at 10:01am by stylzz

calculus
(Integral of) cos x^(1/2) dx Do the substitution part first. Let x^(1/2) = y x = y^2 dx = 2y du So the integral becomes, after substitution 2*(Integral of)y cos y dy Now use integration by parts. You may have to use it twice. You should end up with 2 cos y + y sin y Then ...
Monday, January 21, 2008 at 7:49pm by drwls

math
estimate by rounding the fractions a. 7 8/9* 5 1/13 b. 34 9/10 divided by 4 9/10 c. 14 19/39 divided by 19/39
Thursday, April 8, 2010 at 1:29pm by yolanda

calculus
017 10.0 points Lance Armstrong is moving with speed 35 feet/sec and acceleration 4 feet/sec2 when he crosses the starting line of a stage in the Tour de France. Use a degree two Taylor polynomial T2(t) to estimate how far he travels in the next second. 1. distance = 38 feet 2...
Thursday, September 30, 2010 at 9:37pm by Bob

Math - Polygons and Quadrilaterals
Recall that the length of a diagonal of a rectangle can be calculated by, D^2 = W^2 + L^2 or simply, we'll use the Pythagorean theorem. Substituting, 125^2 = (7x)^2 + (24x)^2 15625 = 49x^2 + 576x^2 15625 = 625x^2 x^2 = 25 x = 5 (this is the multiplier for the ratio) Therefore...
Tuesday, September 10, 2013 at 11:51am by Jai

Physics
An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 39 steps at an angle 45 north of east, then 80 steps at an angle 60 north of west, then 51 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly lost in the ...
Tuesday, September 11, 2012 at 2:07pm by Allison B

Calculus
Easiest way: If (a,b) is some point off the line Ax + By + C = 0 , then distance from that point to the line is |Aa + Bb + C|/√(A^2+B^2) do distance = |3(-3) + 1(-3)-5|/√(9+1) = |-9-3-5|/√10 = 17/√10 long way: slope of line = -3 then slope of ...
Wednesday, October 26, 2011 at 8:25pm by Reiny

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