x+y=1
3x-y=2
x=1-y
3(1-y)-y=2
3-3y-y=2
3-4y=2
-4y=2
y=-0,5
x=1,5
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x+y=1
3x-y=2
x=1-y
3(1-y)-y=2
x=1-y
3-3y-y=2
x=1-y
3-4y=2
x=1-y
-4y=2
x=1-y
y=-0,5
x=1,5
y=-0,5