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3 December, 13:40

Suppose y varies directly as x and y equals 21 when x = 3 find x when y = 42

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Answers (2)
  1. 3 December, 15:33
    0
    y = kx find k

    21 = k*3

    k = 7

    Equation:

    y = 7x

    Find x when y = 42

    42 = 7x

    x = 42/7

    x = 6

    answer: x = 6 when y = 42
  2. 3 December, 16:37
    0
    Y α x

    y = cx where c = constant of proportionality

    cx = y

    c = y/x

    y = 21, x = 3, y = 42, x = ?

    y/x = c

    21/3 = 42/x

    7 = 42/x

    x = 42/7

    x = 6

    so x = 6

    Hope this explains it.
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