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 fuction gives a line with a
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-> 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 fuction gives a line with a
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Question 124396: 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 fuction gives a line with a slope of 0.12. The monthly cost of 30 minutes of calls is $12.63. What is the monthly cost for 21 minutes of calls? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! I would graph minutes on the horizontal axis
and monthly cost on the vertical axis.
The equation for the line is
So the equation is where is in
dollars and is in minutes
The monhly cost for 21 minutes is $11.55
(unless I made a mistake)
