Answer:
x=7
y=-1
Step-by-step 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
substitute in 1
(-9*(-1))-2=x