Solution:
[tex]\begin{gathered} \tan\propto=\frac{y}{x} \\ \\ \tan\propto=\frac{-\sqrt{7}}{\sqrt{5}} \end{gathered}[/tex]
Then, rationalize;
[tex]\begin{gathered} \tan\propto=\frac{-\sqrt{7}}{\sqrt{5}}\times\frac{\sqrt{5}}{\sqrt{5}} \\ \\ \tan\propto=-\frac{\sqrt{35}}{5} \\ \end{gathered}[/tex]
