let's firstly convert it to an improper fraction.

See the picture, please!!
X-12=20
x=20+12
x=32
answer is 32
The answer has to resemble y=Mx+b so to find your y intercept plug in your coordinates into that equation so put your slope in for m and your x intercept in for x and the y intercept in for y so -4= -3(-1)+b now get b alone -1=b so your equation would be y=-3x-1
It doesn’t represent a function so your answer is B!!