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

Question

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 $19.50. The oil change for the other car required 7 quarts of oil and cost $22.00. How much is the labor fee and how much is each quart of oil?

in progress 0
Đan Thu 3 years 2021-08-22T13:11:00+00:00 1 Answers 7 views 0

Answers ( )

    0
    2021-08-22T13:12:21+00:00

    Answer:

    quart of oil = $1.25

    labour = $13.25

    Step-by-step explanation:

    let x = cost of each quart of oil

    y = flat fee for labour

    two equations can be formed from the question

    5x + y = 19.50 equation 1

    7x + y = 22       equation 2

    subtract equation 1 from 2

    2x = 2.5

    divide both sides by 2

    x = 1.25

    substitute for x in equation 1

    5(1.25) + y = 19.50

    y = 19.50 – 6.25

    y = $13.25

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )