Question 99374: Dont get this at all -
The variable Z varies jointly with x and y. Use the given values to write an equation relating x, y, and z. Then find Z when x = -4 and y = 7.
The equation would be z = kxy - right???
Now
x = 1, y = 1/3, z = 5
x = -6, y = 3, z = 2/5
Dont know what to do at all
HELP
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The variable Z varies jointly with x and y.
Use the given values to write an equation relating x, y, and z.
Then find Z when x = -4 and y = 7.
The equation would be z = kxy - right???
That is correct
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If x=-4 and y = 7, then z = k(-4)(7); z=-28k
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Now
x = 1, y = 1/3, z = 5
5 = k(1*(1/3)), k= 15
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x = -6, y = 3, z = 2/5
(2/5) = k(-6)(3)
(2/5) = -18k
(1/5) = -9k
k= -1/45
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Cheers,
Stan H.
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