Linear Function 1: Lionel’s cell phone plan costs $45 per month.

Question

Linear Function 2: The relationship between the number of months Ruby has had her cell phone (x) and the total cost (y) is given by y=40x+60 .

Answer 1

The two linear functions are:

1. Lionel's cell phone plan:
y = $45

2. Ruby's cell phone plan:
y = 40x + 60