1,$\left\{\begin{matrix} 3x^{2}-5xy-4y^{2}=-3 & & \\ 9y^{2}+11xy-8x^{2}=6 & & \end{matrix}\right.$
2,$\left\{\begin{matrix} x^{2}-y^{2} +x+y=5& & \\ x^{3}-x^{2}y-xy^{2}+y^{3}=6 & & \end{matrix}\right.$
3, $\left\{\begin{matrix} 3x^{2}-8xy+4y^{2}=0 & & \\ 5x^{2}-7xy-6y^{2}=0& & \end{matrix}\right.$
4, $\left\{\begin{matrix} 2x^{2}+x+y+1=0 & & \\ x^{2}+12x+2y+10=0 & & \end{matrix}\right.$