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March 6, 2015

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Posted by **Emily** on Thursday, January 13, 2011 at 7:49pm.

x - y = -1

3x + 5y = 21

- MATH -
**helper**, Thursday, January 13, 2011 at 8:06pmto Eliminate x

x - y = -1

3x + 5y = 21

multiply (x - y = -1) by -3

-3x + 3y = 3

3x + 5y = 21

add both equations

0 + 8y = 24

8y = 24

y = 3

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