Horizontal & vertical lines | Mathematics I | High School Math | Khan Academy

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Worked examples identifying the equations and slope of horizontal and vertical lines.

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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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