RREF of $$$\left[\begin{array}{cc}0 & - t\\0 & 0\end{array}\right]$$$
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Your Input
Find the reduced row echelon form of $$$\left[\begin{array}{cc}0 & - t\\0 & 0\end{array}\right]$$$.
Solution
Since the element at row $$$1$$$ and column $$$1$$$ (pivot element) equals $$$0$$$, we need to swap the rows.
Find the first nonzero element in column $$$1$$$ under the pivot entry.
As can be seen, there are no such entries. Move to the next column.
Divide row $$$1$$$ by $$$- t$$$: $$$R_{1} = - \frac{1}{t} R_{1}$$$.
$$$\left[\begin{array}{cc}0 & 1\\0 & 0\end{array}\right]$$$
Answer
The reduced row echelon form is $$$\left[\begin{array}{cc}0 & 1\\0 & 0\end{array}\right]$$$A.