Prove that if a plane has the intercepts a, b, c and is at a distance of p units from
the origin, then 
2
2
2
2
1
1
1
1
p
c
b
a
=
+
+ Choose the correct answer in Exercises 22 and 23 22 Distance between the two planes: 2x + 3y + 4z = 4 and 4x + 6y + 8z = 12 is
(A) 2 units
(B) 4 units
(C) 8 units
(D)
2
29
 units
23