5. The system of equations $\left\{\begin{array}{l}x+x y+y=1, \\ x^{2}+x^{2} y^{2}+y^{2}=17\end{array}\right.$ has the real solution $(x, y)$ $=$ .
(Let $x+y=u, x y=v$. Answer: $x_{1}=\frac{3+\sqrt{17}}{2}$,
$$
\left.y_{1}=\frac{3-\sqrt{17}}{2} ; x_{2}=\frac{3-\sqrt{17}}{2}, y_{2}=\frac{3+\sqrt{17}}{2} .\right)
$$