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7 August, 10:49

The value of y varies directly with x. If x = 3, then y=21. What is the value of x when y=105?

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  1. 7 August, 11:42
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    x = 15

    Step-by-step explanation:

    given that y varies directly with x

    mathematically we can express this as

    y = k x, where k is a constant

    step 1: find k

    given x = 3 and y = 21

    y = k x

    21 = k (3)

    k = 7

    hence the equation becomes

    y = 7 x

    when y = 105,

    105 = 7x

    x = 105 / 7 = 15
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