Systems of equations with elimination (and manipulation) | High School Math | Khan Academy
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In some cases, we need to slightly manipulate a system of equations before we can solve it using the elimination method. So how it's done in this video. Created by Sal Khan.
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High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.
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