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linear function between credit remaining and calling time

There is credit remaining on a phone card in dollars that is a linear function of the total calling time in minutes. The funtion gives a line with a slope of -0.14.

There is a $23.78 credit on the card after 27 minutes of calls. How much credit is there after only 20 minutes in dollars.

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let D be the money (in dollars) remaining on the phone card. And t is the total calling time ...

Solution Summary

The solution is comprised of step-by-step explanation of finding the linear function between the calling time and the credit remaining on a phone card. In turn, the credit remaining is calculated for a given calling time.