Answer
$z=-400, z=20xy$
Work Step by Step
We have to plug in our values to the formula to $axy=z$
That yields,
$-0.25*-3*a=15$ or the equation is $a=20$
Plugging in $x=-4, y=5$,
$-4*5*20=z$ or $z=-400$
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 - 8.1 Model Inverse and Joint Variation - 8.1 Exercises - Skill Practice - Page 555: 26
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