Question

Решить y=2x-1
{
x+y=-4
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Answer 1

y-2x= -1| x(-1)
x+y=-4
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-y+2x=1
x+y=-4 (y зачеркиваем)
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3х=-3| / 3
x=-1
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-1+y=-4
y=-3                                                  Otvet: x= -1, y=-3