Question 135863
A rental company charges $30 a day and 15 cents per mile for renting a car. 
Let y be the total charges (in dollars) for a car for one day and x be the miles driven. The equation for the relationship between x and y is:
Y = 30 + .15X

a. How much will a person pay who rents a car one day and drives it 100 miles?
y = 30+0.15*100 = 30 + 15 = $45
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b. Suppose each of 20 persons rents a car from this agency for one day and drives it 100 miles. Will each of them pay the same amount for renting a car for a day or is each person expected to pay a different amount? Explain.
Each one pays the same as the others.
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c. Is the relationship between X and Y exact or nonexact?
exact
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d. Identify the dependent and independent variables. 
independent: milage
dependent: cost
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Cheers,
Stan H.