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Solving systems with elimination
You can solve a system of equations with either substitution or elimination. This tutorial focuses with a ton of examples on elimination. You'll learn best if you pause the videos and try to do the problem before Sal does. Once you get a hang for things, feel free to skip forward to the exercises.
Common Core Standards: 8.EE.C.8, 8.EE.C.8b
Sal solves a word problem about the weights of TVs and DVDs by creating a system of equations and solving it.
Solving systems by elimination 2
Addition Elimination Method 1
Addition Elimination Method 2
Addition Elimination Method 3
Addition Elimination Method 4
Solving systems by elimination 3
Sal solves the following system of equations by eliminating x: x-4y=-18 and -x+3y=11.
Solve systems of equation with one-step elimination (e.g., x-values or y-values cancel each other out).
Example of solving systems of equations with elimination
Solve systems of equation with multi-step elimination (e.g., a manipulation is need in order for x-values or y-values to cancel each other out).