How do you solve the system of equations 9x=-2y+129 and y=-x+12?

1 Answer
Jul 22, 2017

x=15, y=-3

Explanation:

9x=-2y+129--------(1)
y=-x+12-------------(2)

Substitude(2) into (1)
rArr9x=-2(-x+12)+129
rArr9x=2x-24+129
rArr7x=105
rArrx=105/7
rArrx=15

Substitudex=15into(2)
rArry=-15+12
rArry=-3

:. x=15, y=-3