Posted by **pam** on Friday, February 4, 2011 at 7:38pm.

solve the system of equations by elimination.

3x-4y=22

2x+5y=7

- math -
**helper**, Friday, February 4, 2011 at 7:59pm
3x - 4y = 22

2x + 5y = 7

To eliminate variable x,

Multiply by -2 (3x - 4y = 22)

Multiply by 3 (2x + 5y = 7)

Add equations

-6x + 8y = -44

6x + 15y = 21

0 + 23y = -23

23y = -23

y = -1

To find x,

substitute y = -1, in 2x + 5y = 7

2x + 5y = 7

2x - 5 = 7

2x = 12

x = 6

x = 6, y = -1

- math -
**donneisha**, Friday, February 4, 2011 at 10:47pm
x=6

- math -
**rose**, Sunday, April 1, 2012 at 3:46pm
3x+4y=-22

## Answer This Question

## Related Questions

- algebra - i need help with these problems (either a solution or how to plug them...
- Math - Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of ...
- College Algebra - Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above ...
- Math - I need to use the Gaussian Elimination to solve a system of equations, ...
- Math - Use elimination to solve each system of equations. x+y-2z=10 8x-9y-z=5 3x...
- math - Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^...
- math - Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^...
- Math - Use elimination to solve the system of equations. -x + 2y = 18 x + 8y = -...
- math - Use elimination to solve each system of equations. x+y=3 2x-3y=16
- Math - Use the elimination method to solve the system of equations 5u+2v=15 3u+v...

More Related Questions