Parallel lines from equation (example 2) | Mathematics I | High School Math | Khan Academy
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Sal determines which pairs out of a few given linear equations are parallel. Created by Sal Khan, Monterey Institute for Technology and Education.
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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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