What is the equation of the radical axis of x2+y2−2x=0x^2 + y^2 - 2x = 0x2+y2−2x=0 and x2+y2+4x−6y+4=0x^2 + y^2 + 4x - 6y + 4 = 0x2+y2+4x−6y+4=0?
6x−6y+4=06x - 6y + 4 = 06x−6y+4=0
3x−3y+2=03x - 3y + 2 = 03x−3y+2=0
2x−3y+2=02x - 3y + 2 = 02x−3y+2=0
x−y+1=0x - y + 1 = 0x−y+1=0