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9 December, 14:00

Assume that y varies inversely as x. If y = - 8 when x = - 9, find y when x = 4.

y = 18

y = 72

y = 4.5

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Answers (1)
  1. 9 December, 14:27
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    Y α 1/x

    y = k/x Where k is the constant of proportionality.

    xy = k Cross Multiplying.

    k = xy

    Recall y = - 8 when x = - 9

    k = - 9 * - 8 = 72

    Finding y when x = 4.

    k = xy

    72 = 4y Divide both sides by 4.

    y = 72/4 = 18.

    y = 18.
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