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The variable z varies jointly with x and y Write an equation that relates x,y and z if x=3,y=7 and z=8.Then find z when x=9 and y=4​

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Answer:

z = kxy

k = 0.3

z = 10.8

Step-by-step explanation:

z = kxy

8 = k (3) (7)

= k (21)

8/21 = k (21) / 21

k = 0.3

z = 0.3 (9) (4)

z = 10.8

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