Question 1
Solve the system
$$\begin{cases}\left(1-\dfrac{12}{y+3x}\right)\sqrt x=2,\\[3pt]\left(1+\dfrac{12}{y+3x}\right)\sqrt y=6.\end{cases}$$
$$\begin{cases}\left(1-\dfrac{12}{y+3x}\right)\sqrt x=2,\\[3pt]\left(1+\dfrac{12}{y+3x}\right)\sqrt y=6.\end{cases}$$