Answer
$\text{c. joint variation}$
Work Step by Step
The given equation, $
y=9ab
,$ takes the form $
y=kxz
.$ Hence, the given equation is a
\begin{array}{l}
\text{c. joint variation}
\end{array}
equation.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 6 - Section 6.7 - Variation and Problem Solving - Exercise Set - Page 399: 69
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