Two cell phone companies have different rate plans. runfast has monthly charges $10 plus $4 per gig of data. b a & d’s monthly charge is $6 plus $6 per gig of data. your task is to determine under what circumstances each company has the better pricing. you will derive and solve a set of equations, graph those equations, and evaluate the meanings for these events. don’t worry; i have a series of questions to guide you through the process. good luck! 1. (1pt) determine the equation for the monthly charges for runfast and b a& d. runfast= ba& d= 2. (4 pts)use your mathematical skill to solve this system of equations using the substitution method. (show your work here)