Two cars got an oil change at the same auto shop. the shop charges customers for each quart of oil plus a flat fee for labor. the oil change for one car required 5 quarts of oil and cost $25.10. the oil change for the other car required 7 quarts of oil and cost $29.60. how much is the labor fee and how much is each quart of oil? the labor fee is $ and each quart of oil costs $

The labor fee = $13.85 and

the cost of each quart of oil = $2.25

Step-by-step explanation:

Let x be the flat fee for labor and y be th cost of each quart of oil.

Then, the verbal models for the cars are:

x + 5y = 25.10 --- (1) and

x + 7y = 29.60 --- (2)

(2) - (1) gives,

2y = 4.50

Divide both sides by 2.

y = 2.25

Substitute in (1), we get,

x + 5(2.25) = 25.10

x + 11.25 = 25.10

x = 25.10 - 11.25

x = 13.85

Hence,

The labor fee = $13.85 and

the cost of each quart of oil = $2.25

b.an increase in a causes b to decrease

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