You are given a cell phone bill. You are charged $52 for the month. There is a $40 monthly fee and you are charged $4 per megabyte of data used

Question

1. Construct a linear equation for this model
2. What is the value of the y-intercept? What does it mean?
3. What is the value of the slope? What does it mean?
4. If you use 10 megabytes of data how much would you expect to pay for your bill?
5. Where else might you use this type of model? Be specific.

Answer 1

y = 4x+40

y-intercept is 40...

you pay 40 with NO data used

slope is 4. Every megabyte of data used

increases the price by $4

10 mb used ---> 40 +4*10 = 80

uses it right now to find out how

many MB of data was used...

52 = 4x + 40

12 = 4x

x=3