SOLUTION: Suppose that the monthly cost of a long-distance phone plan (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a

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Question 1063184: Suppose that the monthly cost of a long-distance phone plan (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of
0.12
The monthly cost for
39 minutes of calls is
$15.86. What is the monthly cost for
47minutes of calls?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
This is NOT a proportion as it stands, because there is a basic charge which is the same to both bills. But the slope of the line is the cost of each additional minute, which is 12 cents. That means that 8 more minutes (from 39 to 47) would cost 96 more cents, and the bill would be $16.82.