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24 November, 19:47

Z varies jointly with x and y.

When x = 2 and y = 3, z = 60.

What is the value of z when x = 4 and y = 9?

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  1. 24 November, 19:53
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    First, let's find "k" the constant of variation:

    z = k. x. y (since z varies jointly with x and y)

    60 = k. (2). (3) → 60 = 6k and k = 10, So z = 10x. y

    z = 10 (4) (9) = 10 (36) and z = 360
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