Concept explainers
To find:therate of phone call for first minute and each other minute.
Answer to Problem 9P
The rate of phone call for first minute and each other minute are $2.80 and $1.20, respectively.
Explanation of Solution
Given information:
The rate of phone call at one rate for first minute and at a different rate for each other minute.
The call cost of 7 minutes is $10 and the call cost of 4 minute is $6.40.
Calculation:
Let x be a rate phone call for first minute and let y be the rate of phone call for each other minutes.
Here, x is a fixed minute for all calls
The call cost of 7 minutes is $10 can be converted into equation,
The call cost of 4 minute is $6.40can be converted into equation,
Compute the solutions of the system
Subtract the equations
Divide on both sides by3,
Substitute
Therefore, the rate of phone call for first minute and each other minute are $2.80 and $1.20, respectively.
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Algebra and Trigonometry: Structure and Method, Book 2
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