Answer
The vectors are linearly dependent.
Work Step by Step
The given set of vectors
$\begin{bmatrix}
3 \\
5\\
-1\\
\end{bmatrix}$, $\begin{bmatrix}
0 \\
0\\
0\\
\end{bmatrix}$, $\begin{bmatrix}
-6 \\
5\\
4\\
\end{bmatrix}$
contains the zero vector, so by Theorem 9, the set of vectors is automatically linearly dependent. .