Find the equation of the circle concentric with the circle `x^(2)+y^(2)-8x+6y-5=0` and passing through the point (-2,-7),

Find the equation of the circle concentric with the circle x^2 + y^2+4x+ 6y+11=0 and Passing through the point (5, 4).

If a circle is concentric with the circle x^(2)+y^(2)-4x-6y+9=0 and passes through the point (-4,-5) then its equation is

Find the equation of a circle concentric with the circle x^2 + y^2-2x -4y + 1 = 0 and whose radius is 5.

Find the equation of a circle concentric with the circle : 2x^2 + 2y^2-6x+8y+1=0 and of double its area.

Find the equation of the circie concentric with the circle x^2 + y^2 + 4x-8y- 6 = 0 and having radius double of its radius.

Find the equation of the circle, whose centre lies on the line 2x- y- 3 = 0 and which passes through the points (3, - 2) and (-2, 0).

Find the equation of a circle concentric with x^2 + y^2-4x -6y -3 = 0 and which touches the y-axis.

Find the equation of the circle whose centre lies on the line x-4y = 1 and which passes through the points (3, 7) and (5, 5).

Find the equation of the circle which cuts the circle x^(2)+y^(2)+5x+7y-4=0 orthogonally, has its centre on the line x=2 and passes through the point (4,-1).