Solving 3 Variable Linear Systems Substitution / Gaussian Elimination

I introduce how to solve 3 variable linear systems with the elimination method and then work through 2 examples that each have one unique solution. Other 3 variable system lessons: 3 Variable Systems: Parabola Equation Given 3 Points, Investment Word Problem https://www.youtube.com/watch?v=myBAIjMIXK8 Matrices and Gaussian Elimination https://www.youtube.com/watch?v=ybQbWYBEZzc Determinant of Square Matrices https://www.youtube.com/watch?v=BXzYYfYqeYM Cramer's Rule Solving Systems of Equations https://www.youtube.com/watch?v=MM5L3a1xjTg Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage www.YouTube.com/Profrobbob