3 Show that the line through the points (4, 7, 8), (2, 3, 4) is parallel to the line
through the points (– 1, – 2, 1), (1, 2, 5) 4 Find the equation of the line which passes through the point (1, 2, 3) and is
parallel to the vector 
ˆ
ˆ
ˆ
3
2
2
i
j
k
+
−