Algebra › Slope (an introduction)

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A number that tells you the steepness of a line

CCSS.MATH.CONTENT.8.EE.B.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.

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https://schoolyourself.org/page/lti/sy/algebra/slope-intro

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