The locus of the mid-point of the chord of contact of tangents drawn from points lying on the straight line 4x-5y=20 to the circle x2+y2=9 is
20(x2+y2)2−36x+45y=0
20(x2+y2)+36x−45y=0
36(x2+y2)−20x+45y=0
36(x2+y2)+20x−45y=0
From origin, chords are drawn to the circle x2+y2−2y=0.The locus of the middle points of these chords is
A pair of tangents are drawn from the origin to the circle x2+y2+20(x+y)+20=0. The equation of the pair of tangents is