Fill in the missing entries by performing the indicated row operations to obtain the row-reduced matrix.\\ $\begin{bmatrix} 1 & 3 & \\ 3 & 8 & \end{bmatrix} \begin{bmatrix} 1 \\ 1 \end{bmatrix} \xrightarrow{R_2 - 3R_1} \begin{bmatrix} 1 & 3 & 1 \\ \boxed{} & \boxed{} & \boxed{} \end{bmatrix} \xrightarrow{-R_2} \begin{bmatrix} 1 & 3 & 1 \\ \boxed{} & \boxed{} & \boxed{} \end{bmatrix} \xrightarrow{R_1 - 3R_2} \begin{bmatrix} 1 & 0 & -5 \\ 0 & 1 & 2 \end{bmatrix}$
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