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Add slope-intercept article (#30720)

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Mark Gross 2019-04-01 10:57:12 -07:00 committed by The Coding Aviator
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## Intro to Slope Intercept Form
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<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
### Slope Intercept Form: y = mx + b
The graph of a linear equation can be described by its slope and the point at which it crosses the y-axis, known as the y-intercept. A common form of representing a linear equation that follows this description is slope intercept form. *m* represents the slope of the line, and is often represented as a fraction. One way to remember how to interpret this fraction as a slope is "rise over run." For a fraction n/d, for every d units moved right, the plotted point moves n units up. *b* represents the y value at which the line crosses the y-axis.
#### More Information:
<!-- Please add any articles you think might be helpful to read before writing the article -->
* [Intro to slope-intercept form - Khan Academy](https://www.khanacademy.org/math/algebra/two-var-linear-equations/slope-intercept-form/v/slope-intercept-form)