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06-05-2017
Mathematics

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-2x+15y=24 2x+9y=24, what is the value of x and y

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apologiabiology apologiabiology

06-05-2017

eliminate x's by adding te 2 equations

add them

-2x+15y=24
2x+9y=24 +
0x+24y=48

24y=48
divide both sides by 24
y=2

sub back

2x+9y=24
2x+9(2)=24
2x+18=24
minus 18 both sides
2x=6
divide 2
x=3

x=3
y=2

(x,y)
(3,2)

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