The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 42 minutes of calls is $15.26 and the monthly cost for 94 minutes is $19.94 . What is the monthly cost for 82 minutes of calls?

Question

The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 42 minutes of calls is $15.26 and the monthly cost for 94 minutes is $19.94  . What is the monthly cost for 82  minutes of calls?

hero · Answer

It's a linear function, so the rate is the same.

anonymous · Answer

do the same thing that i showed you in your other question about the airplane. use the slope which will show you the rate of change and solve from there