Line Equation Application Word Problem: Balance on Phone Card
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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 39 minutes of calls is 12.02 and the monthly cost for 81 minutes is 17.06 . What is the monthly cost for 75 minutes of calls?
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Solution Summary
Through a detailed explanation of the problem, this solution discusses how to find the monthly cost for 75 minutes of calls. This is all completed in 330 words and in a step-wise manner.
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To figure out this problem, you need to name your variables first. X and Y are the variables and x will stand for time while Y will stand for cost. Now we have to set up our points. We know these points because they are given to us in the problem.
We have (39, 12.01) and (81, 17.06). From these points we can figure out the slope. We do this by subtracting the y from the first point from the y in second point and ...
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