a,$\left\{\begin{matrix} 64x^{4}-(x^{3}-x)y^{2}-(y+12)x^{2}+6=0 & & \\ 5x^{4}-(x^{2}-1)y^{2}-11x^{3}+5=0 & & \end{matrix}\right.$
b, $\left\{\begin{matrix} (x^{4}-2x^{3}+x^{2})(1+y^{2}-2y)=16y & & \\ 2x^{2}y-2xy+y^{2}+1-10y=0& & \end{matrix}\right.$