Answer:
2/-2 im pretty sure its been a while since ive done a promblem like this. I hope this helps :)
Y - 1 = 1/4 (x - 12)
4(y - 1) = x - 12
4y - 4 = x - 12
x - 4y = -4 + 12
x - 4y = 8
16 times 5 the square root of16 is 4. You don't have a square root of 5
The answer is square root of 39. 64-25=39