Question

Determine the slope of the line represented by the equation: -3x+4=12
do I need to set it up as y=mx+b?

Answer 1

if you want, but actually, the slop is m, like you said.

Answer 2

There isn't a y and the final result would be x=## which is a vertical line which would mean that the slope is undefined(vertical line test)

Answer 3

I just need to solve, but I don't need to set it up as y=mx+b?

Answer 4

No, because as @Grazes said, the slope is undefined, because there is no y.
"If there is no y, then there is no slope!" --my teacher