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2. z varies jointly as x and y. If z = 3 when x = 3 and y = 15, find z when x = 6 and y = 9.
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LheLhengviz

Answer:

z = kxy

3 = k(3)(15)

3 = k45

k = 3/45

k = 1/15

z = 1/15(6)(9)

z = 54/15

z = 18/5

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