Elimination (Part II: Subtracting or Multiplying by -1)
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This video will explain how to solve a system of linear equations by elimination. I will show you 2 methods for solving when one of the variables has the same coefficient in both equations:
Method #1: Subtract the two equations to eliminate one of the variables.
Method #2: Multiply one of the equations by -1, and then add the two equations to eliminate one of the variables.
The solution for the practice problem in this video is (1.35, 2.25).
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Timestamps:
00:00 Introduction
00:18 Method 1: Subtracting bc y has the same coefficients
03:26 Method 2: Multiply by -1, then add
05:51 2nd Example
08:25 Practice Problem for you!