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30 January, 14:50

If z varies jointly with x and y, x = 2 and y = 2, z = 7. Find z when x = 4 and y = 8.

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  1. 30 January, 17:25
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    56

    Step-by-step explanation:

    z varies jointly with x and y:

    z = kxy

    When x = 2 and y = 2, z = 7.

    7 = k (2) (2)

    k = 7/4

    z = 7/4 xy

    When x = 4 and y = 8:

    z = 7/4 (4) (8)

    z = 56
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