x2+y2−4x+5y+6=0x^{2}+y^{2}-4 x+5 y+6=0x2+y2−4x+5y+6=0
x2+y2+4x−5y−8=0x^{2}+y^{2}+4 x-5 y-8=0x2+y2+4x−5y−8=0
x2+y2−4x+5y+8=0x^{2}+y^{2}-4 x+5 y+8=0x2+y2−4x+5y+8=0
x2+y2−4x+5y=0x^{2}+y^{2}-4 x+5 y=0x2+y2−4x+5y=0