How would I do this question.

Determine the value(s) of $h$ such that the matrix is augmented of a consistent linear system.

My matrix
\begin{bmatrix}
1&h&4\\
3&6&8
\end{bmatrix}

I am not sure how to format it very well in latex. But I do not get this question I am not sure what they are asking. I just know how to find x and y.