Rozwiąż układ równań
x-2y=7
3x+y=7 /*2
6x+2y=14
7x=21 /:7
x=3
3*3+y=7
y=7-9
y=-2
3x+y=7/*2
-------------- +
7x=21/:7
y=7-9=-2
Odp. x=3, y=-2
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x-2y=7
3x+y=7 /*2
x-2y=7
6x+2y=14
7x=21 /:7
x=3
3*3+y=7
y=7-9
y=-2
x=3
y=-2
x-2y=7
3x+y=7/*2
x-2y=7
6x+2y=14
-------------- +
7x=21/:7
x=3
3*3+y=7
y=7-9=-2
Odp. x=3, y=-2