rozwiąż układ równań
x+2y=4
y-x=-1
-x+y=-1/*(-2)
2x-2y=2 +
--------------
3x=6/:3
x=2
2+2y=4
2y=-2+4
2y=2/:2
y=1
-x+y=-1
____________
3y=3
x+2*1=4
x+2=4
x=4-2
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x+2y=4
y-x=-1
x+2y=4
-x+y=-1/*(-2)
x+2y=4
2x-2y=2 +
--------------
3x=6/:3
x=2
2+2y=4
2y=-2+4
2y=2/:2
y=1
x+2y=4
y-x=-1
x+2y=4
-x+y=-1
____________
3y=3
y=1
x+2*1=4
x+2=4
x=4-2
x=2