Question

what is the slope of th line 7x-9y=63

Answer 1

7/9. Solution: Graph it. It crosses the axis at y=-7 and x=9. Its rise is 7 and run 9.

Answer 2

The answer is simple, you want to isolate Y by itself. Remember the equation y=mx+b, m being the slope and the B being a y intercept.
the answer would be y=-7+7/9x