SOLUTION: the monthly cost of a long distance phone plan is a linear function of the total calling time (in minutes) The monthly cost for 51 minutes of calls is 16.99 and the monthly cost fo

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: the monthly cost of a long distance phone plan is a linear function of the total calling time (in minutes) The monthly cost for 51 minutes of calls is 16.99 and the monthly cost fo      Log On


   

Question 1089653: the monthly cost of a long distance phone plan is a linear function of the total calling time (in minutes) The monthly cost for 51 minutes of calls is 16.99 and the monthly cost for 65 minutes is 18.53. what is the monthly cost for 55 minutes of calls?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
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The rate for each minute between 51+ minutes and -65 minutes is %2818.53-16.99%29%2F%2865-51%29 = 1.54%2F14 = 0.11.


Therefore, 55 minute call will cost 16.99 + 0.11*(55-51) = calculate . . .