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Standards/Math/Alabama/8.9.a

8.9.a

8.9 Interpret y = mx + b as defining a linear equation whose graph is a line with m as the slope and b as the y-intercept.
8.9.a
8.9.b
8.9.c
8.9.d

Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in a coordinate plane.

Khan Academy Resources
Proving slope is constant using similarity
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