How do solve the following linear system?: $3x + 4y = -2 , 3x + y = -20$ ?

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Answer 1 · 2016-01-21T17:41:06

$3x+4y=-2..................(i)$
$3x+y=-20................(ii)$

Subtracting (ii) from (i) we get

$3y=18$
$implies y=6$

Put $y=6$ in $(i)$

$implies 3x+4(6)=-2$

$implies 3x+24=-2$
$implies 3x=-26$
$implies x=-26/3$

How do solve the following linear system?: 3x + 4y = -2 , 3x + y = -20 3x + 4y = -2 , 3x + y = -20 ?