Posted by Daniel on Sunday, April 8, 2012 at 7:15pm.
The TeX makes it hard to read, but it appears you want to solve
y = x + 2
y = -3x + 10
If that's so, then just substitute the 1st value for y into the 2nd equation:
x+2 = -3x+10
4x=8
x=2
so, y=4
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