MATRICES

Here is a video which goes through multiplication of matrices

---

Here is a second video which gives more examples on multiplication of matrices

Here is a third video which explains multiplication of matrices

This video goes through how to calculate the determinant of a 2 by 2 matrix

This video goes through how to find the inverse of a 2 by 2 matrix

Here is an excellent video that goes through how to solve
simultaneous equations using matrices

Here is another video which goes through solving simultaneous equations with matrices (NOTE: In the UK, where this video comes from, matrices are written with curved parantheses instead of square brackets)