Find the vector equation of the line passing through the point (1, 2, – 4) and
perpendicular to the two lines:
7
10
16
19
3
8
−
=
−
+
=
−
z
y
x
and 
15
3
x −
 = 
29
5
8
5
y
z
−
−
=
− 21 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