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