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 lin

Question 1063193:

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
0.09
. See the figure below.
The monthly cost for
47
minutes of calls is
$12.76
. What is the monthly cost for
44
minutes of calls

Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
slope = (y(2) - y(1)) / (x(2) - x(1))
:
0.09 = (12.76 - (y(1)) / (47 - 44)
:
12.76 - y(1) = 0.27
:
-y(1) = -12.49
:
y(1) = 12.49
:
****************************************
The monthly cost of 44 minutes is $12.49
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:

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