What is a linear system? A 2 by 2 example. (Breakfast series part 3)

In this video, we present an example (2 by 2) of a linear system by imposing a second linear equation in addition to the equation we had in part 1 and part 2 of the series. This is the 3rd video in the "What to eat for breakfast?" series.
This video is based on some previous videos:
Definition of a linear equation:
• What is a linear equat...
Example of a linear equation (Part 1 of the breakfast series) • Video
How to verify & visualize a solution of a given linear equation (Part 2 of the breakfast series)
• Video