Enter values for the matrix.
Enter fractions with a slash, as "3/4" or "-10/3".

Multiply the row to make the red cell a one.

\(\left[\begin{array}{rrr|r}\large\color{Red} {2} & 1 & -1 & -6 \\ -1 & 5 & -1 & -1 \\ -2 & -4 & 4 & 6\end{array}\right]\begin{array}{ll}\large\phantom{1} & \\ \phantom{1} & \\ \phantom{1} & \end{array}\)