The given points in the problem is (7/4, 0) and (8,-9)
Then write the equation in point-slope form.this would be m = (-9 - 0)/(8 - 7) = -9
Then form this in the format: y = mx + b
then solve for "b":
-9 = -9*8 + bb = 8
The equation in slope form is:y = -9x + 8