If (1, 2) is a limiting point of a coaxial system of circles containing the circle `x^(2)+y^(2)+x-5y+9=0`, then the equation of the radical axis, is

If (1,2) is a limiting point of the coaxal system of circles containing the circle x^(2) + y^(2) + x - 5y + 9 = 0 then the equation of the radical axes is

If (1,-2) is a limiting point of a coaxal system of which the circle x^(2) + y^(2) - x - 2y - 1 = 0 is a member , then the equation of a circle of the system passing through origin is

One of the limiting points of the co-axial system of circles containing the circles x^(2)+y^(2)-4=0andx^(2)+y^(2)-x-y=0 is

One of the limiting points of the co-axial system of circles containing the circles x^(2)+y^(2)-4=0andx^(2)+y^(2)-x-y=0 is

One of the limiting points of the co-axial system of circles containing the circles x^(2)+y^(2)-4=0andx^(2)+y^(2)-x-y=0 is