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12 February, 12:22

Suppose that y varies jointly with x and z. Find your when x=3 and z=5, given that y=72 when x=6 and z=4

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  1. 12 February, 12:35
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    Y α xz

    y = kxz y = 72, when x = 6, and z = 4

    72 = k*6*4

    72 = k*24

    24k = 72

    k = 72/24

    k = 3.

    y = kxz

    y = 3xz

    Finding y, when x = 3, z = 5.

    y = 3xz

    y = 3*3*5

    y = 45
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