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y+x= -1 +2
y+x=5
-y-x= -1
0=4
b)x-y=4+4
x+y=3+3+4
x-y=8
x+y=10
2x=18
x=9
y=(x+2)-1
(x+2)-1+(x-2)=3
x+2-1+x-2+3
2x-1=3
2x=4
x=2
y=4-1
y=3
b)x(y-4)=4
(x-3)+(y-4)=3
x-y+4=4
x=y