18-05-2017
Mathematics

contestada

3(3x-7y=16 and -9x + 5y=16

Respuesta :

28-05-2017

Equation 1) 3x - 7y = 16
Equation 2) -9x + 5y = 16

Multiply equation 1 by 3.

1) 3(3x - 7y = 16)

1) 9x - 21y = 48
2) -9x + 5y = 16

Add equations together.

-16x = 64

Divide both sides by -16.

x = -4

Plug in -4 for x in the first equation.

3x - 7y = 16

3(-4) - 7y = 16

Simplify.

-12 - 7y = 16

Add 12 to both sides.

-7y = 16 + 12

Simplify.

-7y = 28

Divide both sides by -7.

y = -4

So, our answer is :

(-4, -4)

~Hope I helped!~

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