Answer:
54.5
Step-by-step explanation:

Multiply 8 by x and 8 times 2 you should get 8x+16. Divide 8x by 8 and divide 16 by 8. Leaving x=2
Plug in 12 for y and rewrite the equation.
12 = 4x + 4
Subtract 4 from both sides.
8 = 4x
Divide by 4 on both sides.
2 = x
The ordered pair is (2, 12) and x = 2.