\[y = \frac{k}{x};\ \ \ \ C(8; - 3)\]
\[k = yx = 8 \cdot ( - 3) =\]
\[= - 24 \Longrightarrow y = - \frac{24}{x}\]
\[D\left( - \sqrt{6};4\sqrt{6} \right)\]
\[- \frac{24}{- \sqrt{6}} = \frac{24\sqrt{6}}{6} = 4\sqrt{6}\]
\[Ответ:k = - 24;\ \ \ \]
\[да,\ принадлежит.\]