32. Mr. Stone's phone bill is based on a flat fee plus a cost per text
message sent each month. The table below shows possible
amounts of the phone bill, y, related to the number of text
messages, x, Mr. Stone sends during a billing period.
0
15
22
Number of Text Messages, X
30
Amount of Phone Bill, y
18
21
22.4
24
Which function also represents the same linear relationship?