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x=2+y
2(2+y)+y=4
4+2y+y=4
3y=0
y=0
x=2
2-0=2
2*2+0=4
L=P
b)
x=-2y
2y+y=-3
3y=-3
y=-1
x=2
2+2*(-1)=0
2-2=0
-2-1=-3
L=P