fanny031722 fanny031722

28-04-2016
Mathematics

contestada

2x + y =20
6x - 5y =12

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apologiabiology apologiabiology

28-04-2016

multiply firs equaiton by -3
-6x-3y=-60
add to other equation

-6x-3y=-60
6x-5y=12 +
0x-8y=-48

-8y=-48
divide by -8
y=6

sub
2x+y=20
2x+6=20
minus 6
2x=14
divide 2
x=7

x=7
y=6
(7,6)

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