Represent credit hours at each of the two schools with two different variables

From the question, write out the equation that relates the credit hours of the two schools

From the question, it can be observed that the credit hours at Westside is represented as W.
Therefore, the equation becomes

Represent the dollar amount per credit hour at westside Community College using a and the total dollar amount for the two classes to be b. Then b becomes

If a is given as$98, then b becomes

Make y the subject of the equation (2) and substitute in equation 3


Hence, the expression for the combined total dollar amount he paid for his class fees is 1955 - 17W