Two phone companies, Unitel and Cellberry, offer different cell phone data plans. Unitel's plan charges $19.95 per month and $14.95 for each gigabyte of data. Cellberry's plan charges $9.95 per month and $17.50 for each gigabyte of data. a. Write a system of equations to represent the two plans and solve it by graphing.

b. Interpret the solution to the system. How many gigabytes do you get when the two plans cost the same amount. What will the cost of the plans be?

c. If you need more than 3.92 gigabytes of data, which company should you choose.