You and your friend join a new gym that requires a one-time joining fee and monthly payments. Your friend chooses the 1 year pla
n and pays $687, while you elect the 18 month contract which costs $981. Use this information to determine the linear model used to calculate cost from months of membership.
Factorize the numerator and denominator. You'll see that they both have a factor of 4 that can be canceled. The introduce a factor of 3 to change the denominator to 36.
