\[\sqrt{2y - 6} + \sqrt{\frac{y}{3} + 5}\]
\[\left\{ \begin{matrix} 2y - 6 \geq 0\ \ \ \ \ \ \ \\ \frac{y}{3} + 5 \geq 0\ \ | \cdot 3 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 2y \geq 6\text{\ \ \ \ \ \ \ \ } \\ y + 15 \geq 0 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y \geq 3\ \ \ \ \ \ \\ y \geq - 15 \\ \end{matrix} \right.\ \]
\[При\ y \geq 3.\]
\[Ответ:при\ y \geq 3.\]