Foot of perpendicular from `(8,9)` on y -axis is

Fill up in each of the following: (i) The coordinates of foot of perpendicular from (3, 7, 9) on yaxis is _____________.

The circle with radius 1 and centre being foot of the perpendicular from (5,4) on y-axis,is x^(2)+y^(2)-8x-15=0

The coordinates of the foot of the perpendicular from (a,0) on the line y = mx + a/m are

The equation of the straight line passing through the foot of the perpendicular of (4,5) on to x -axis and image of the same point w.r.t. y-axis is

The foot of the perpendicular from (2,4,-1) to the line (x+5)/(1)=(y+3)/(4)=(z-6)/(-9) is