Solve by substitution or elimination

Combine the information in the problem and the chart using the average balance method to solve the problem.

Write a function rule for the table

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?