y varies directly as x, if y=9 x=3 find x when y=-27

Question

y varies directly as x, if y=9 x=3 find x when y=-27

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Khang Minh 2 months 2021-07-23T13:46:04+00:00 1 Answers 1 views 0

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    2021-07-23T13:47:17+00:00

    Answer:

    x = -9

    Step-by-step explanation:

    Standard equation of direct variation:

    y = kx

    We need to find k.

    We use the given point.

    When x = 3, y = 9.

    9 = k * 3

    k = 3

    Our equation is

    y = 3x

    Now we find x when y = -27.

    y = 3x

    -27 = 3x

    x = -9

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