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Question #abbc0

1 Answer

Mar 4, 2017

$(x,y)=(-4,5)$

Explanation:

If $3color(red)x+4y=8$
and $color(red)x=color(red)(16-4y)$
then
$color(white)("XX")3(color(red)(16-4y))+4y=8$

$color(white)("XX")48-12y+4y=8$

$color(white)("XX")40=8y$

$color(white)("XX")y=5$

and since $x=16-4y$
$color(white)("XX")x=16-4 * 5=-4$

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