Answer
$\vec{u}=\vec{i}+4\vec{j}$
Work Step by Step
$\vec{u}=\langle1,4\rangle$
To write $\vec{u}$ in terms of $\vec{i}$ and $\vec{j}$, just write the first component of $\vec{u}$ times $\vec{i}$ plus the second component of $\vec{u}$ times $\vec{j}$:
$\vec{u}=\langle1,4\rangle=\vec{i}+4\vec{j}$
