Question

$x + 7y = - 2 \\ - x - 4y = - 1$
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Answer 1

x+7y=-2

-x-4y=-1

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3y=-3

y=-3/3

y=-1

x+7y=-2

x+7.(-1)=-2

x-7=-2

x=-2+7

x=5

Espero ter ajudado!!!