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Function word problem

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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 .11.

The monthly cost for 40 minutes of calls is 16.68. What is the monthly cost for 32 minutes of calls?

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Solution Summary

This provides an example of determining monthly cost by creating a function.

Solution Preview

let x be the number of calling minutes, y be the monthly cost.

since slope = 0.11

Therefore,

y = 0.11x + b

now ...

Solution provided by:
Sandhya Sharma, MSc
Education
  • BSc, Meerut University
  • MSc, Meerut University
  • MPhil, Institute of Advanced Studies
  • MSc, AIT
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