# College Algebra

Solve using Elimination or Substitution:

4x^2+9y^2=36
x+3y=3

1. 👍 0
2. 👎 0
3. 👁 102
1. Ideal for substitution
from the 2nd : x = 3 - 3y

sub into 1st

4(3-3y)^2 + 9y^2 = 36
36 - 72y + 36y^2 + 9y^2 = 36
45y^2 - 72y = 0
5y^2 - 8y = 0
y(5y-8) = 0
y = 0 or y = 8/5

if y = 0 , x = 3

if y = 8/5 , then x = 3-24/5 = -9/5

intersection points (3,0) and (-9/5, 8/5)

1. 👍 0
2. 👎 0
posted by Reiny
2. Thanks for the help.

1. 👍 0
2. 👎 0
posted by Chris

## Similar Questions

1. ### algebra

i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of

asked by Alyssa on April 5, 2011
2. ### Math

x=-y+3 5x-y=-2 Solve using Elimination I already solved the equation using Substitution, Graphing, and a table I just need a little more help on Elimination. I know that in Elimination they have to be in the same form so I put it

asked by M on January 20, 2015
3. ### Algebra

Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your work! (I can'tfigure out how to graph it and when i used substitution and elimination it came out with two different anwsers. I got (13/3.5,19/10.5) for

asked by Darryl on January 17, 2011
4. ### Algebra 1

bobpursey, In this problem you helped me with earlier: Solve using any appropriate method. y = 2× - 5, y = ½× + 1 Substitution, substitute for y. 2×-5=½ × + 1 3/2 x=6 x=4 y= 2*4-5=3 How did you choose which method you were

asked by slomo on January 3, 2015
5. ### Algebraic Systems

Okay i just wanna know what you think is the easiest between substitution and elimination/combination. I hate elimaination becuase i get confused quicker with this when actually solving it than in substitution, but it's actually

asked by <3Medic+Droid<3 on January 25, 2009
6. ### Math Homework

Hello! I need help with these math questions, thanks! :) 1.) Solve the system by substitution. 5x + 2y = -17 x = 3y 2.) Solve the system by substitution. x/3 + y = 4/3 -x + 2y = 11 3.) Solve the system by elimination. 2x - 3y = 0

asked by Beni on December 7, 2013
7. ### algebra2

solve the systems of equation: First : 4x-2y = 2 Second: y = -4x-7 Should i solve by using substitution, elimination or multiply then use elimination? Try adding them. Add up the left sides and the right sides (after rearranging

asked by ann on July 26, 2007
8. ### Math-Algebra

Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your work! (I can'tfigure out how to graph it and when i used substitution and elimination it came out with two different anwsers. I need help! and i need to be able

asked by Darryl on January 17, 2011

Solve the following system of equations using matrices. Use Gaussian elimination with back substitution or Gauss-Jordan elimination. a. 3x1 + 5x2 - 8x3 + 5x4 = -8 b. x1 + 2x2 - 3x3 + x4 = -7 c. 2x1 + 3x2 - 7x3 + 3x4 = -11 d. 4x1 +

asked by sandra on April 6, 2017
10. ### math/ elimination& substitution

how do i solve this? using elimination or substitution? 2x-3y=-1/12 y=-x+7/12

asked by Keyshia on May 16, 2013
11. ### algebra 2 honors

Solve by substitution or elimination 1.) -6=3x-6y 4x=4+5y 2.) r+x= -1 2r-3s=6

asked by kianna on October 22, 2013

More Similar Questions