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!~