A customer at an online movie rental company pays a total of $15 after 1 month, a total of $20 after 2 months, and a total of $25 after 3 months. The total amount paid is represented by T and the number of months by m. Which equation models the total payment, T, after m months?

A.
T = 10m + 5

B.
T = 5m + 10

C.
T = 10m

D.
T = 5m + 20

Question

A customer at an online movie rental company pays a total of $15 after 1 month, a total of $20 after 2 months, and a total of $25 after 3 months. The total amount paid is represented by T and the number of months by m. Which equation models the total payment, T, after m months?
 
 A.
T = 10m + 5
 
 B.
T = 5m + 10
 
 C.
T = 10m
 
 D.
T = 5m + 20

calculusxy · Answer

you can make two coordinates in here:
(month, payment)

(1 month, $15)
(2 months, $20) 
(3 months $25)

now you can try to find the m and b variables in the slope-int form: y = mx + b

1) i recommend for u to find the slope 
slope = $\frac{y_2 - y_1}{x_2 - x_1}$