Find the Indicated Vector $\mathbf { a } = 3 \mathrm { i } , \mathbf { b } = \mathbf { i } + \mathrm { j }$

Multiple Choice

Find the indicated vector.
-Let $\mathbf { a } = 3 \mathrm { i } , \mathbf { b } = \mathbf { i } + \mathrm { j }$ . Find $3 \mathbf { a } - \mathbf { b }$ .

A) $\mathbf { i } - 8 \mathbf { j }$
B) $8 \mathbf { i } - 3 \mathbf { j }$
C) $11 \mathrm { i } + \mathbf { j }$
D) $8 \mathbf { i } - \mathbf { j }$