A person can join The Fitness Center for $50. A member can rent the tennis ball machine for $10 an hour. Write a linear function to model the relationship between the number of hours the machine is rented (x) and the total cost (y).
(a) write a equation for this problem
(b) what is the initial value
(c) Determine the cost for renting the tennis ball machine for 2 hours? for 5 hours? and 0 hours?
(d) How many hours did a member rent the tennis ball machine if the total cost was $130?