Marcus is a member of a theater club. He pays a monthly fee and his movie tickets are then $5 for an unlimited number of movies that month. Look at the graph to answer the question. Find the monthly fee. I can't put the graph on here, so I'm just going to list the points. 1, 12.50; 2, 17.50; 3, 22.50; 4, 27.50
please tell me the rate of change, the initial value and the equation​