2. Sam has two part-time jobs, delivering pizza and mowing lawns. He makes $9/hr delivering pizza and $7/hr mowing lawns. Last week he worke

Question

2. Sam has two part-time jobs, delivering pizza and mowing lawns. He makes $9/hr delivering pizza and $7/hr mowing lawns. Last week he worked a total of 32 hours and made $248. How many hours did he work at each job

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Tài Đức 5 years 2021-09-02T22:32:30+00:00 1 Answers 12 views 0

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  1. binhan
    0
    2021-09-02T22:34:13+00:00
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    Answer:

    22 hours and 10 hours

    Step-by-step explanation:

    let the jobs be x and y, so that

    x+y=32——–1

    9x+7y=248—-2

    x=32-y

    substitute x=32-y for x in equation 2 we have

    9(32-y)+7y=248

    open bracket we have

    288-9y+7y=248

    -2y=248-288

    -2y=-40

    2y=40

    divide both sides by 2 we have

    y=40/2

    y= 10 hours

    subtitute y=10 for y in equation 1 to find x

    x+10=32——–1

    x=32-10

    x=22

    x=22 hours

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