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21 April, 04:00

Write function rule and find k.

1) z varies jointly with x and y, and

when x=2 and y=3, z=72

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Answers (1)
  1. 21 April, 06:16
    0
    z = 12xy

    Step-by-step explanation:

    Given z varies jointly with x and y then the equation relating them is

    z = kxy ← k is the constant of variation

    To find k use the condition when x = 2 and y = 3, z = 72, that is

    72 = k * 2 * 3 = 6k (divide both sides by 6)

    12 = k, then

    z = 12xy ← equation of variation
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