x+2y=-2
2x-y=1
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x+2y = -2
2x-y = 1
x = -2-2y
2*(-2-2y)-y = 1
-4-4y-y = 1
-5y = 5 /:(-5)y = -1
2x-(-1) = 1
2x+1 = 1
2x = 1-1
2x = 0 /:2
x = 0
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x+2y = -2
2x-y = 1
x = -2-2y
2x-y = 1
2*(-2-2y)-y = 1
-4-4y-y = 1
-5y = 5 /:(-5)
y = -1
2x-y = 1
2x-(-1) = 1
2x+1 = 1
2x = 1-1
2x = 0 /:2
x = 0