Express the Vector X as a Linear Combination of the Uʹs

Multiple Choice

Express the vector x as a linear combination of the uʹs.
- $$\mathbf { u } _ { 1 } = \left[ \begin{array} { r } 2 \\- 4\end{array} \right] , \mathbf { u } _ { 2 } = \left[ \begin{array} { r } 12 \\6\end{array} \right] , \mathbf { x } = \left[ \begin{array} { c } 32 \\- 4\end{array} \right]$$

A) $\mathbf { x } = 4 \mathbf { u } _ { 1 } + 2 \mathbf { u } _ { 2 }$
B) $\mathbf { x } = - 4 \mathbf { u } _ { 1 } - 2 \mathbf { u } _ { 2 }$
C) $\mathbf { x } = 2 \mathbf { u } _ { 1 } + 4 \mathbf { u } _ { 2 }$
D) $\mathbf { x } = 4 \mathbf { u } _ { 1 } - 2 \mathbf { u } _ { 2 }$