2 answers:
y = x +2
x +3y =-2
x + 3(x+2) = -2
x +3x +6 = -2
4x +6 = -2
4x = -8
x = -8/4 = -2
x = -2
y = -2 + 2
y = 0
x=-2, y = 0
It's easier to substitute the first equation into the second.
x + 3 (x+2) = -2
x + 3x + 6 = -2
4x + 6 = -2
4x = -8
x = -2
y = 0
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