Circle

$x y+x+2 y+2=0$

$x^2-x y-2 y^2+3 x-6 y=0$

$2 x^2+5 x y+2 y^2+13 x+14 y+20=0$

$2 x^2-9 x y+9 y^2+3 x-6 y+1=0$