Question 329501
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=-1 and y=4.

1) x=2, y=4, z=-2
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z = kxy
-2 = k*2*4
k = -1/4
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Then find z when x=-1 and y=4.
z = (-1/4)*(-1)*4
z = 1