How do you solve the following system?: $7x +y =-2 , -7x +y = -9$

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Answer 1 · 2016-01-22T21:35:00

$7x+y=-2....................(i)$
$-7x+y=-9........................(ii)$

Add (i) and (ii)

$implies 2y=-11$

$implies y=-11/2$

Put $y=-11/2$ in $(i)$

$implies 7x-11/2=-2$ multiply both sides by $2$

$implies14x-11=-4$

$implies 14x=7$

$implies x=1/2$

How do you solve the following system?: 7x +y =-2 , -7x +y = -97x +y =-2 , -7x +y = -9