Question

2y +9 =x 9x- 8y=31
System of substitution

Answer 1

x = -1

y = -5

Explanation:

9(2y+9) - 8y = 31

18y + 81 - 8y = 31

10y + 81 = 31

10y = -50

y = -5

2(-5) + 9 = x

-10 + 9 = x

-1 = x

Answer 2

I have solve it in above picture