I don't know how to do this.

[Fresssh]

I'm not sure what to do and I've never done matrices before. There were videos posted and I'm just really confused

 

[JeffM]

Can you link the videos?

 

[Dr.Peterson]

I'm not sure what to do and I've never done matrices before. There were videos posted and I'm just really confused

This is introductory material, so you can find information about it easily. Here are a couple good sources to read:

7.6: Matrices and Matrix Operations

To solve a systems of equations, we can use a matrix, which is a rectangular array of numbers. A row in a matrix is a set of numbers that are aligned horizontally. A column in a matrix is a set of …

math.libretexts.org

Matrices

Once you have enough ideas to give it a try, show us whatever you've done, even if you know it's wrong, so we can have something specific to help you with.