$\left\{ \begin{array}{l}
\sqrt {x + {y^2} + 2} + \sqrt {3x + {y^2} + 5} = 3{x^2} + {y^2} - 3x + 4\\
{y^3} + {y^2}\sqrt {2x - 1} = 2xy + \sqrt {8{x^3} - 12{x^2} + 6x - 1}
\end{array} \right.$