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12-01-2017
Mathematics

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Solve the system of the linear equation by adding or subtracting.

7x - y = 9
7x + 2y = 24

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apologiabiology apologiabiology

12-01-2017

first equation by -1 and add to 2nd equaton

-7x+y=-9
7x+2y=24 +
0x+3y=15

3y=15
divide by 3 both sides
y=5

sub back
7x-y=9
7x-5=9
add 5 both sides
7x=14
divide by 7 both sides
x=2

x=2
y=5
(2,5)

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