SOLUTION: 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 30 minutes of calls is $15.46 and the

Question 174355: 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 30 minutes of calls is $15.46 and the monthly cost for 84 minutes is $20.32. What is the monthly cost for 54 minutes of calls?
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!

We'll interpolate the given data to get monthly cost for 54 minutes, which represented by :

, cross multiply

}

------->
, Monthly cost for 54 minutes.
Thank you,
Jojo
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