Answer:
The cost for each call minute is $0.03 or equivalently 3 cents.
Step-by-step explanation:
We let the cost for each call minute be x and the cost for each text message be y. Scott's cost function in terms of x and y is;
95x + 207y = 23.55............. (1)
On the other hand, Maria's cost function in terms of x and y is;
162x + 124y = 17.26.............. (2)
Therefore, we have two equations in x and y which can be solved simultaneously.
In order to determine the cost for each call minute, we shall simply determine the value of x.
Using elimination method, we can eliminate y and determine x;
We multiply the first equation by 124,
11780x + 25668y = 2920.20..........(3)
We then multiply the second equation by 207,
33534x + 25668y = 3572.82........(4)
Subtracting equation 3 from 4 yields;
21754x = 652.62
x = 0.03
Thus the cost for each call minute is $0.03 or equivalently 3 cents.
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