The image of plane `2x-y+z=2` in the plane mirror `x+2y-z=3` is `x+7y-4x+5=0` (b) `3x+4y-5z+9=0` `7x-y+2z-9=0` (d) None of these

The image of plane 2x-y+z=2 in the plane mirror x+2y-z=3 is (a) x+7y-4x+5=0 (b) 3x+4y-5z+9=0( c) 7x-y+2z-9=0 (d) None of these

The equation of the plane through intersectioof planes x=2y+3z=4 and 2x+y-z=-5 and perpendicular to the plane 5x+3y+6z+8=0 is (A) 7x-2y+3x+81=0 (B) 23x+14y-9z+48=0 (C) 51x+15y+50z+173=0 (D) none of these

The angle between the planes 3x-4y+5z=0 and 2x-y-cz=5 is

Image of line (x - 2)/3 = (y - 1)/1 = (z - 1)/(-4) in the plane x + y + z = 7 is

The equation of the plane through the intersection of plane x+2y+3z=4 and 2x+y-z-5 and perpendicular to the plane 5x+3y+6z+8=0 is (A) 7x-2y+3z+81=0 (B) 23x+14y-9z+48=0 (C) 51x+15y+50z+173=0 (D) none of these

Measure of angle between the planes 5x-2y + 3z-7=0 and 15x - 6y+9z+5=0 is