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17 August, 03:40

Given that y and x are directly proportional and

y=2 when x=7, find the value of y when x=17.5.

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Answers (2)
  1. 17 August, 03:46
    0
    The answer is: 5.

    Step-by-step explanation:

    Set up an equation:

    2 / 7 = y / 17.5

    Cross multiply:

    7y = 2 * 17.5

    7y = 35

    y = 35 / 7 = 5
  2. 17 August, 04:01
    0
    y = 5.

    Step-by-step explanation:

    Direct proportionality is : y = kx where k is a constant.

    Finding k by substituting the given values of x and y:

    2 = k * 7

    k = 2/7.

    So the equation is y = 2/7 x.

    When x = 17.5:

    y = 2/7 * 17.5

    y = 5.
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