Answer
$x$ and $y$ must have different signs.
Work Step by Step
The expression $-\dfrac{x}{y} >0$ is equivalent to $\dfrac{x}{y}<0$
For the expression $\dfrac{x}{y}<0$ to be true, $x$ and $y$ must have different signs.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.2 Real Numbers and Their Properties - R.2 Exercises - Page 22: 114
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