#### Answer

$y=kxz$

#### Work Step by Step

Because $y$ varies jointly as $x$ and $z$, we equate $y$ to a constant multiple of $x$ and $z$:
$y=kxz$.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$y=kxz$

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