You just touch the screen over and over
High school for me is now over. This knowledge comes from my second favorite class! I mean second favorite from those four years. RREF is amazing. RREF was therapy. RREF is magic. * This inverts a random matrix to the identity matrix. To get the actual inverse, you simultaneously apply the same process to another identity matrix but I didn't show that. Also I am extremely sorry if you got a matrix that didn't work. I have no idea what the chances of that are but it's pretty unlikely. SOME matrices just don't invert. ALL matrices can be inverted though. Using pseudo inverse but that makes me cry because it is difficult.