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Direct Variation: If y = 12, when x = 4, find y when x = 20. a. 40 b. 48 c. 12 d. 60

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  1. 3 November, 00:39
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    d

    Step-by-step explanation:

    Given the x and y are in direct variation then the equation relating them is

    y = kx ← k is the constant of variation

    To find k use the condition y = 12 when x = 4, that is

    12 = 4k (divide both sides by 4)

    3 = k

    y = 3k ← equation of variation

    When x = 20, then

    y = 3 * 20 = 60 → d
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