We watch starting at 8:58 to the end of the video in class as an equilibrium demo, but the rest of the video is excellent as well.
How to use Solvers (Desmos and TI-84) - If you are interested in trying a solver this doc gives directions on how to use Desmos (the online calculator College Board provides for the exam) or TI-84 solvers to do the algebra of things like the equilibrium calculations.Â