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a) 2x=2
x+y=2
2x=2
x=2-y
2*(2-y)=2
4-2y=2
-2y=2-4 /: (-2)
y=1-2
y=-1
x=3
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a) 2x=2
x+y=2
2x=2
x=2-y
2*(2-y)=2
x=2-y
4-2y=2
x=2-y
-2y=2-4 /: (-2)
x=2-y
y=1-2
x=2-y
y=-1
x=3