#### Answer

a) $x^4y=c$
b) $x^4y/z=c$

#### Work Step by Step

a)
$x^4y=c$
b)
$x^4y/z=c$
We divide by $z$ since $c$ is a constant (and direct variation is a constant multiplied by a variable equal to another variable).

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Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

a) $x^4y=c$
b) $x^4y/z=c$

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