Ответ:
1)2x+y+7-7=0-7
2x+y=-7
2)3x=18-6
3x=12
x=4
3)0,5x-y=-4
5x-10y=-40
x-2y=-8
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Ответ:
1)2x+y+7-7=0-7
2x+y=-7
2)3x=18-6
3x=12
x=4
3)0,5x-y=-4
5x-10y=-40
x-2y=-8