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9 September, 08:28

If y varies jointly with x and z and y=90 when x=2 and z=9, find x when y=105 and z=3

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  1. 9 September, 09:48
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    Step-by-step explanation:

    y & xz

    y = kxz

    k = y/xz

    When y = 90, x = 2 and z = 9

    k = 90 / (2*9) = 10/2

    k = 5

    y = 5xz

    When y = 105 and z = 3

    105 = 5*3x

    105 = 15x

    x = 105/15

    x = 7
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