1) $\left\{\begin{matrix} x^{2}+ xy +2 = 3x +y & \\ x^{2}+y^2 =2 & \end{matrix}\right.$
2) $\left\{\begin{matrix} 3x^{3}=5y+66 & \\ 3y^{3}= 5x+66 & \end{matrix}\right.$
3) $\left\{\begin{matrix} x^{2}=(5y+4)(4-y) & \\ x^{2}-5y^{2}-4xy+16y-8x+16=0 & \end{matrix}\right.$