Answer
$\frac{3}{2}$.
Work Step by Step
The given expression is
$=-3x^{-1}y$
Use the law of exponents $a^{-n}=\frac{1}{a^{n}}$
$=\frac{-3y}{x^{1}}$
Substitute $x=2$ and $y=-1$.
$=\frac{-3(-1)}{(2)^{1}}$
Simplify.
$=\frac{3}{2}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A12: 108
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