Mark wants to buy some used CDs from Hastings. He can get 6 CDs for $50.10 and 9 CDs for $75.15. Write the equation that can be used to find f(x), the amount he would pay at this rate if he bought x CDs.

Question

Thanks in advance :)

Answer 1

find the rate r so that
r = 50.10/6 or 75.12/9 , they are the same

f(x) = rx