Click through the graphs and select the one that could represent the relationship between the cost, c, of a call and the time, t, for the cell phone plan shown below. time in hours 0 1 2 3
cost in dollars 10 13 16 19

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.