We simply put the values of x and y into the inequality.
(-3,-5)
[tex]\begin{gathered} -x<-y \\ -(-3)\stackrel{?}{<}-(-5) \\ 3<5 \\ \text{TRUE} \end{gathered}[/tex](-2,-1)
[tex]\begin{gathered} -x<-y \\ -(-2)\stackrel{?}{<}-(-1) \\ 2\nless1 \\ \text{FALSE} \end{gathered}[/tex]