Question

-9y-2=x
4x-3y=31
Solve by substitoution

Answer 1

x=7

y=-1

Explanation:

x=-9y-2--------(1)

4x-3y=31

4x=31+3y

x=31/4+3/4y-------(2)

x=-9y-2=31/4+3/4y

-9y-3/4y=31/4+2

-39/4y=39/4

y=-1

substitute in 1

(-9*(-1))-2=x

x=7