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8.EE.6 - Use similar triangles to explain why the slope m is the same between any two distinct points on the non-vertical line in the coordinate plane; derive the equation y = mx + b for a line intercepting the vertical axis at b.

Website:

http://www.purplemath.com/modules/slope.htm

 

Video:

https://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/slope-and-intercepts/v/slope-of-a-line

 

Image:

Relfextion:

The content I've added is a good resource for someone learning about this topic because they are good sources with lots of information from the basics to higher levels. Something interesting or new that I learned about this topic was that you get undefined if you try to get the slope of a vertical line.

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