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2x-y=2
y = 4-x
-y = 2-2x / *(-1)
y=4-x
y=-2+2x (przyrównuję)
4-x=-2+2x
-3x=-6 / : (-3)
x = 2
y = 4-x
y = 2
2x-y=2
x=y-4
2(y-4)-y=2
x=y-4
2y-8-y=2
x=y-4
y=10
x=10-4
y=10
x=6
y=10