Limiting points of the coaxial system

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

Origin is a limiting point of a coaxial system of which x^(2)+y^(2)-6x-8y+1=0 is a member. The other limiting point, is

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

One of the limit point of the coaxial system of circles containing x^(2)+y^(2)-6x-6y+4=0, x^(2)+y^(2)-2x-4y+3=0 , is

The point (2,3) is a limiting point of a co-axial system of circles of which x^(2)+y^(2)=9 is a member. The coordinates of the other limiting point is given by

If the origin be one limiting point of system of co-axial circles of which x^(2)+y^(2)+3x+4y+25=0 is a member ,find the other limiting point.