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7 February, 22:31

X and y vary directly and x=6 when y=42, find k. What is y when x=12?

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Answers (2)
  1. 7 February, 22:39
    0
    Since x and y are directly proportional, so x = ky

    6 = 42k

    k = 6/42 = 1/7

    12 = (1/7) y

    y = 84
  2. 7 February, 22:58
    0
    The answer would be 21 i think.
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