Solve the Problem $\mathbf { u } = 7 \mathbf { i } - 4 \mathbf { j }$

Multiple Choice

Solve the problem.
-If $\mathbf { u } = 7 \mathbf { i } - 4 \mathbf { j }$ and $\mathbf { v } = - 2 \mathbf { i } + 9 \mathbf { j }$ , find $\mathbf { u } + \mathbf { v }$ .

A) $- 9 i + 5 j$
B) $5 \mathbf { i } + 5 \mathbf { j }$
C) $9 \mathbf { i } + 4 \mathbf { j }$
D) $4 i + 5 j$