I work as a tutor for linear algebra. Students will often have a problem that requires them to row reduce, and they'll make an arithmetic mistake somewhere. Often they'll ask for my help finding their mistake.
I often will go through the operations myself, but it takes a bit of time. Do you have any recommendations for an online app that can check each row operation? Ideally the app would:
- Display previous matrices, and the row operations that led to each.
- Allow you to "go back" if you made a mistake.
I've found a couple ones, like this one: https://www.zweigmedia.com/RealWorld/tutorialsf1/scriptpivotold.html. However, it doesn't print the previous versions of the matrix, and it doesn't let you "go back."