rozwiąż układ równanń
2x-y=x+4
y-(-x-1)=-1
2x-x-y=4
y=x+1=-1
x-y=4
x+y=-2 dodajemy stronami
2x=2
x=1
2*1-y=1+4
-y=5-2
-y=3
y=-3
x=1 y=-3
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2x-y=x+4
y-(-x-1)=-1
2x-x-y=4
y=x+1=-1
x-y=4
x+y=-2 dodajemy stronami
2x=2
x=1
2*1-y=1+4
-y=5-2
-y=3
y=-3
x=1 y=-3