Answer
$V=5i-4j.$
Work Step by Step
We draw the given vector by sketching an arrow from the origin ti the point $(5,-4)$, as shown in the figure.
Since $I$ is vector of length $|$ in the positive a-direction, $5i$ will be a vector of length $5$ in that same direction. Similarly $-4j$ will be a vector of length $-4$ in the positive $y$-direction. Hence, $V$ is the resultant of vectors $5i$ and $-4j$.
Therefore, we can write $V$ in terms of the unit vectors $i$ and $j$ as $V=5i-4j.$