Interpreting equations graphically (example 2) | Mathematics III | High School Math | Khan Academy
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Sal finds the coordinates of points on a graph that are solutions to a given equation.
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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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