SOLUTION: If y varies jointly as x and z and y=10 when z=4 and x=5, find y when x=4 and z=2.

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Question 76659This question is from textbook Algebra 2
: If y varies jointly as x and z and y=10 when z=4 and x=5, find y when x=4 and z=2. This question is from textbook Algebra 2

Answer by stargrl12566(16) About Me  (Show Source):
You can put this solution on YOUR website!
First write down the formula. y=kxz
Then plug in the set of numbers in which you have three for. In this case
10=k(5)(4)
Then solve
10=20k
k=1/2
Then plug in the second set of numbers using the 1/2 for k.
y=(1/2)(4)(2)
y=4