System of Equations with 3 variables - Part 2
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Lesson Description:
This video shows how to solve a system of 3 three linear equations in 3 variables using the substitution method, and also partly the addition (elimination) method to solve a system of 2 equations. The same problem is solved in the first part of this lesson series using the Addition Method.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- How do you solve a system of 3 equations with 3 variables with the substitution method?
- How do you solve the system of equations 3x + 2y + z = 1, x - 2y + 2z = 4, 2x + 4y + 3z = 9?
- Where do you start when trying to solve a system of 3 equations in 3 variables?
- How can you check your solution to a system of 3 equations?
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Staff Review
This lesson does a great job of showing how to solve a system of 3 equations in 3 variables using the substitution method. This same problem was done in the previous lesson in this series using the elimination / addition method. The elimination method is actually used deep into this problem in 1 step because it is easier. Each step involved in this sometimes difficult process is shown. This is a great place to start to learn how to solve a system of 3 equations.
