Chapter 1, Problem 4.2EC

I need help finding the accurate solution to this general accounting problem with valid methods.

I need help with this financial accounting question using standard accounting techniques.

The monthly cost (in dollars) of a data plan for Magnet Mobile is a linear function of the total data usage (in gigabytes). The monthly cost for 20 gigabytes of data is $42.00, and the monthly cost for 35 gigabytes is $55.50. What is the monthly cost for 26 gigabytes of data?