Determinents

So today in class we kept on learning about matrices and determinents. Turns out its too hot to work outside on the garden. But I hope we start on it soon because it will get more students to participate and actually look forward to school...maybe. Anyways we worked on matrices and equations. Its basically just finding "x" and "y" and solving the problem. Again, it's hard to explain so I'll just show you:

It's hard to get at first,but once you really sit and stare and think about it, it starts to make sense.