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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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