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8 March, 22:34

2. If y varies inversely as x and

y = 3 when x = 5, find x when y = 2.5

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Answers (1)
  1. 9 March, 00:45
    0
    Step-by-step explanation:

    From the law of variation,

    y 1/x, where is the constant of proportionality. Therefore

    y = k/x where k is a constant

    3 = k/5 and k = 15

    To find x when y = 2.5 (5/2)

    Go back to the second equation

    y = k/x

    5/2 = 15/x

    When you cross multiply

    5x = 30.

    Divide through by 5,

    x = 6.
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