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Suppose that a car rental agency charges a fixed amount per day plus an amount per mile for renting a car. heidi rented a car one day and paid $58 for 190 miles. on another day she rented a car from the same agency and paid $86 for 330 miles. find the linear function f(x) (where x is in miles and f(x) is in dollars) that the agency could use to determine its daily rental charges.

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Respuesta :

190 miles = 58
330 miles = 86
Since both have the fixed amount, 
330 - 190 miles = $(86 - 58)
140 miles = $28
1 mile = $0.20

To find the fixed cost:
190 miles = 190 x 0.2 = $38
$58 - $38 = $20

f(x) = 20 + 0.2x

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