A. (17/4, 25/4)

B. (-17/4, 25/4)

C. (17/4, -25/4)

D. (-17/4, -25/4)

The equation of the circle which touch the y-axis at a distance 4 from the origin and make an intercept 6 on the x-axis is

The circle on the chord x cos α+ y sin α=p of the circle x^{2}+y^{2}=r^{2} as diameter is

The internal centre of similitude of the two circles x^{2}+y^{2}+6x-2y+1=0, x^{2}+y^{2}-2x-6y+9=0 is

If the line x+y+1=0 touches the circle x^{2}+y^{2}-3x+7y+14=0, then the point of contact is

The equation of the tangents to a circle x^{2}+y^{2}-4x-6y-12=0 and parallel to 4x-3y=1 are