Answer
The Span$\{V_{1}, V_{2}\}$ is the $xz$ plane.
Work Step by Step
Since the $y$-coordinate in both vectors is zero, it follows that the $y$-coordinate in any linear combination of $V_{1}$ and $V_{2}$ would have zero value. In other words, Span$\{V_{1}, V_{2}\}$ is made up of all the vectors in the space $\mathbb{R}^{3}$ that have zero $y$-coordinates. This is precisely the $xz$ plane.
