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        7-9,13+

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        Part of East Tennessee PBS
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        Expressions and Equations -- Grade 8: 8.EE.B.6 | Tennessee Department of Education

        Teach students to 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. This video also explains how to derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis.

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