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2x+4y=8
x=1+y
2(1+y)+4y=8
x=1+y
2+2y+4y=8
x=1+y
2y+4y=8-2
x=1+y
6y=6 /:6
x=1+y
y=1
x=1+1
y=1
x=2
y=1
2x=+4y=8
4x-4y=4
2x+4y=8
6x=12
x=2
x-y=1
2-y=1
y=1