Question

A gym charges its members a one-time registration fee of $25, and then a monthly fee of $9. Write a linear function to represent the cost, , of being a member of the gym for months.

Answer 1

y= 9x+25. 
 9 is the monthly fee which is also known as the rate of change and 25 is the initial cost just to get in the gym. AKA the y-intercept.