Posted by **Pam** on Friday, May 16, 2008 at 10:09am.

Can someone please tell me how to solve this problem? Trying to help a teen who is staying with me with their homework, but I am clueless.

Thanks.

- Algebra -
**bobpursley**, Friday, May 16, 2008 at 10:17am
Please post the question.

- Algebra -
**Pam**, Friday, May 16, 2008 at 10:33am
Oops....sorry, I forgot to put the problem in.

-2y = 228 + 8x

10x + 11y = -64

Solve each system of equations using the substitution method.

- Algebra -
**bobpursley**, Friday, May 16, 2008 at 1:41pm
Put them in standard form:

8x+2y=-228

10x+11y=-64

Elminate a variable. I will pick x. Multiply the top equation by 10, the second equation by 8

80x+20y=-2280

80x+88y=-64*8

now subtract the second equation from the first..

-68y=-2280+64*8

and proceed to solve for y. Then, substitue back in the original equation, either one, and solve for x.

- Algebra -
**anthony**, Friday, May 16, 2008 at 2:54pm
x+y=-8 3x-y=-4

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