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x+2y=2
x=2,5-1,5y
2,5-1,5y+2y=2
0,5y=-0,5 :1/2
y=-1
x=2,5-1,5*-1
y=-1
x=4
x+2y=2
2x+3y=5 | +
-2x-4y=-4 | +
---------------------------
-y=1
y=-1
2x+3*(-1)=5
2x-3=5
2x=5+3
2x=8
x=4
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