Question

Find the slope of the line whose equation is px - qy = r

Answer 1

If you solve for y, and write the equation in the form y = mx + b, then m, the coefficient of the x term, is the slope.

Answer 2

I have no clue how to do it. I was looking for the answer but steps how to get it.

Answer 3

You need to solve for y. That means you need to isolate y.
The first step is to subtract px from both sides.