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 $20.30. the oil change for the other car required 7 quarts of oil and cost $22.80. how much is the labor fee and how much is each quart of oil?

1.25$/per quart of oil. 14.05 starting fee.  

Step-by-step explanation:

Give a variable that one quart of oil is o.

5o + starting fee +2.5 = 7o + starting fee

2o = 2.5

o = 1.25

substitute and we know starting fee is 14.05

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

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step-by-step explanation: