Let P (-2, 3, -4) is a point in space. Find the co-ordinates of the foot of perpendicular from this point to ZX-plane.

A(2, 3, 4) : x>0, y>0, z>0
The point is in octant XOYZ or I
B(6, -3, 3): x>0, y<0, z>0
The point is in octant XOY'Z or IV
C(2, -1, -6) : octant XOY'Z' or VIII
D(2, 2, -3) : octant XOYZ' or V
E(-1, 3, -6): octant X'OYZ' or VI
F(-1, 3, 3): octant X'OYZ or II
G(-3, -2, 5): octant X'OY'Z' or III
H(-1, -2, -5): octant X'OY'Z or VII

(i) Distance of P(a, b, c) from XY-plane = 
∴ Distance of A(2, -3, 4) from XY - plane = 

(ii) Distance of P(a, b, c) from ZX-plane = 
∴  Distance of B(4, -3, 1) from ZX-plance = 

(iii) Distance of P(a, b, c) from YZ-plane = 
∴ Distance of C (3, -2, -1) from YZ-plane =