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06-06-2017
Mathematics

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18x-16y=-312 78x-16y=408

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apologiabiology apologiabiology

08-06-2017

elimination
multiply first equation by -1 and add to 2nd

-18x+16y=312
78x-16y=408 +
60x+0y=720

60x=720
divide both sides by 60
x=12

sub back

18x-16y=-312
18(12)-16y=-312
216-16y=-312
-16y=-528
divide both sides by -16
y=33

x=12
y=33
(x,y)
(12,33)

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