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14 June, 01:50

If y varies directly with x and y is 9 when x is 5, what is x when y is - 1

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Answers (2)
  1. 14 June, 04:09
    0
    We use the fact that y = kx, where k is the constant of proportionality.

    9 = 5k

    9/5 = k

    Now that we know k, we can find x when y = - 1.

    -1 = x (9/5)

    -1 / (9/5) = x

    -5/9 = x

    Did you follow?
  2. 14 June, 04:26
    0
    x = - 0.56

    Step-by-step explanation:

    if y varies directly with x

    i. e

    y ∝ x

    y = kx

    where k is the constant of variation

    when y is 9 and x is 5

    9 = 5k

    k = 9/5

    k=1.8

    when y=-1

    then

    -1=kx

    -1=1.8x

    x = - 0.56
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