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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 a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b. 

The content I’ve added is a good resource for someone learning about this topic because it shows how to derive the quadratic formula using the points x,y, and the other image shows that slope triangles are proportional, as they occur in ratios.

 

Something interesting or new that I learned about this topic was how you derive y=mx+b from a graph.

3/1=9/3

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