christipalmer122001 christipalmer122001

28-01-2020
Mathematics

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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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MathPhys MathPhys

28-01-2020

Answer:

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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