A wireless carrier offers the following plans that a person is considering.

Question

The Family Plan:

$70 monthly fee, unlimited talk and text on up to 5 lines, and data charges of $30 for each device for up to 2 GB of data per device.

The Mobile Share Plan: 

$160 monthly fee for up to 10 devices, unlimited talk and text for all the lines, and data charges of $10 for each device up to a shared total of 10 GB of data.



Find the model of the total cost of the Family Plan in dollars. Use P for the number of devices that need data plans as part of their cost.

Answer 1

Family Plan:

C = 70 + 5 * P

P <= 5

Mobile Plan:

C = 160 + 10 * P

P <= 10

Where C is cost