rozwiąż metoda dowolna :
-2x+y=4
2x+2y=2
___________
3y=6 /:3
y=2
-2x+2=4
-2x=4-2
-2x=2 /:(-2)
x=-1
∫-2x+y=4/*(-2)
∫2x+2y=2
∫4x-2y=-8
∫2x+2y=2 +
----------------
6x=-6/:6
-2+2y=2
2y=2+2
2y=4/:2
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-2x+y=4
2x+2y=2
___________
3y=6 /:3
y=2
-2x+y=4
-2x+2=4
-2x=4-2
-2x=2 /:(-2)
x=-1
∫-2x+y=4/*(-2)
∫2x+2y=2
∫4x-2y=-8
∫2x+2y=2 +
----------------
6x=-6/:6
x=-1
-2+2y=2
2y=2+2
2y=4/:2
y=2