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x-y=-2 /*(-1)
2x-y=1
-x+y=2
+ 2x-y=1
x= 3
y= 2+x
x=3
y= 5
2)
3x+2y=2 /*(-2)
5x+4y=6
-6x-4y= -4
+ 5x+4y= 6
-x= 2
x= -2
5*(-2)+4y= 6
-10+4y=6
4y= 16
y= 4
x= -2