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15 March, 09:40

What is the constant of variation, k, of the direct variation, y = kx, through (5, 8) ?

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  1. 15 March, 09:42
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    (5,8) ⇒ x = 5; y = 8

    y = kx

    8 = k5

    k = 8/5 ⇒ 1.60 in decimal and 1 3/5 in mixed fraction.

    To check:

    y = kx

    y = 1.6 (5)

    y = 8

    y = kx

    8 = 1.6x

    8/1.6 = x

    x = 5
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