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x-y=-2 /*3
2x+3y=1
3x-3y=-6
dodaje stronami;
2x+3x+3y-3y=1-6
5x=-5 /:5
x=-1
x-y=-2
-1-y=-2
-y=-1 /:(-1)
y=1
odp.
x=-1
y=1
x-y=-2
x=y-2
podstawiamy do pierwszego
2*(y-2)+3*y=1
wyznaczamy y:
2*y-4*3*y=1
5*y=5
y=1
podstawiamy do drugiego rownania
x-y=-2
x-1=-2
x=-1
x=-1, y=1