SOLUTION: If Y varies jointly as X and Z and Y=60 when X=10 and Z= -3, what is Y when X=8 and Z=15?

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Question 2291: If Y varies jointly as X and Z and Y=60 when X=10 and Z= -3, what is Y when X=8 and Z=15?
Answer by matthew_sessoms(39) About Me  (Show Source):
You can put this solution on YOUR website!
y=kxz


60=k(10)(-3)
60=-30k
k=-2


y=-2xz


y=-2(8)(15)
y=-240

MS