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-x+y=2
czyli dodajemy stronami
-2x=-4
x=2
y=2+x=4
-x+y=2
-y+y=0
-x-x=-6+2
-y+y=0
-2x=-4 |:-2
-y+y=0
x=2
y=4
-x+y=2
x+y=6
-x+y=2
x-x (<-skracaja sie) + y + y = 6 +2
2y = 8 / :2
y=4
y=4
x+y=2
y=4
x=2 - y
y=4
x=2-4
y=4
x=-2