Chapter R - Review of Basic Concepts - R.2 Real Numbers and Their Properties - R.2 Exercises - Page 22: 109

$x=(+), y=(+)$ or $x=(-), y=(-)$

The question asks for the signs of values $x$ and $y$ that would make the statement $xy>0$ true. If the values $x$ and $y$ are known to be nonzero values, a positive $x$ and positive $y$ value would give a product greater than $0$. A negative $x$ and negative $y$ value would also give a product that is greater than $0$.