===============================================
Work Shown:
Plug x = 8 into the function. Simplify.
f(x) = 5x-15
f(8) = 5*8-15
f(8) = 40-15
f(8) = 25
The input x = 8 leads to the output y = f(x) = 25.
The domain is the set of all allowed x inputs.
The range is the set of all possible y outputs.
The point (x,y) = (8,25) is on the graph of f(x) = 5x-15.
