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

### Perform the indicated operation(s) on the matrix.

$$\left[\begin{array}{rrr|r}-4 & 1 & 3 & 11 \\ 5 & 5 & 5 & -15 \\ 5 & 0 & -4 & -18\end{array}\right]\begin{array}{ll}\phantom{1} & -\frac{1}{4}R_1 \to R_1 \\ \phantom{1} & \\ \phantom{1} & \end{array}$$