Answer
Constant
Work Step by Step
When $z$ varies jointly with $x$ and $y$, it means that $\frac{z}{xy}$ is constant. Mathematically:
$$ \frac{z}{xy} = k $$
Where k is the constant of variation.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 8 Rational Functions - Chapter Review - Page 603: 2
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