rozwiąż Równanie metodą przeciwnych-współczynników:
2x - y = 4
x + 2y = 7
2x-y=4
x+2y=7 /*(-2)
-2x-4y=-14
_______________
-5y=-10 /:(-5)
y=2
2x-y=4 /*2
x+2y=7
4x-2y=8
______________
5x=15 /:5
x=3
2x-y=4 |*2
5x=15 |:5
3+2y=7
2y=7-3
2y=4 |:2
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2x-y=4
x+2y=7 /*(-2)
2x-y=4
-2x-4y=-14
_______________
-5y=-10 /:(-5)
y=2
2x-y=4 /*2
x+2y=7
4x-2y=8
x+2y=7
______________
5x=15 /:5
x=3
2x-y=4 |*2
x+2y=7
4x-2y=8
x+2y=7
5x=15 |:5
x=3
x+2y=7
3+2y=7
2y=7-3
2y=4 |:2
y=2
x=3
y=2