An online streaming service charges a monthly fee as well as a one-time sign-up fee. The cost for this online streaming service is modeled by the following function where m represents the number of months the service is subscribed to and C(m) represents the total cost given that amount of time:

C(m) = 13m + 9

In the above function, what is the slope? ________

What is the y-intercept? ________

How do we interpret the slope of this function? __________

How do we interpret the y-intercept of this function? __________