Mathematics

Problem

Let

\mathbf a = \langle 2,\,3,\!-1\rangle

and

\mathbf b = \langle -4,\!-6,\,2\rangle

. Which statement correctly describes the relationship between

\mathbf a

and

\mathbf b

? a) Parallel and in the same direction b) Neither parallel nor perpendicular c) Parallel and in the opposite direction d) Perpendicular