The function f(x)=30x+150 represents the total cost of a gym membership at Jon’s Gym for x months plus a signup fee. Bella’s Gym has no signup fee and charges $45 dollars per month. Which statement is true? Select one:

Bella's Gym represents a proportional relationship and Jon's does not

Jon's Gym represents a proportional relationship and Bella's does not

Neither Bella or Jon's gym represents a proportional relationship

Both Bella and Jon's gym represent a proportional relationship