Let f(x) = m x +C , where m and C are real numbers.
Then the expression
\frac{f(x + h) - f(x)}{h}
can be written in the form Ah + Bx + D , where A , B , and D are
constants. (Note: It's possible for one or more of these
constants to be 0.) Find the constants.

Use your answer from above to find

You can earn partial credit on this problem.