SV#5 Unit J: Concept 3-4

What should you be careful about? Everything! There are small mistakes that people do a lot and I don't want you guys to do a small mistake! But when you're watching my video please be really be careful when I change the signs when I'm doing the elementary row operations, which in fact have confused a lot of people in the past so yeah. :P Be careful! But other than that I think you guys should be okay! :D