6 If y varies directly as x and y = -7 when x = -28, find y when x = 20. PLZ help ASAP

Question

6
If y varies directly as x and y = -7 when x = -28, find y when x = 20.
PLZ help ASAP

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Thông Đạt 3 years 2021-08-29T11:02:31+00:00 1 Answers 3 views 0

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  1. thienhuong
    0
    2021-08-29T11:03:35+00:00
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    Answer:

    5

    Step-by-step explanation:

    y ∝ x

    y = k times x

    where ‘k’ is constant

    substitute y for -7 and x for -28

    -7 = k times -28

    -7 = -28k

    Divide through by -28

    \frac{-7}{-28} = \frac{-28k}{-28}

    = \frac{1}{4} =k

    formula y = \frac{1}{4} times x

    y = \frac{1}{4} times 20

    y = 5

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