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How use the slope formula and find the slope of a line, whether the Slope is positive, negative or undefined.

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Interactive lesson with video explanation of how to find the slope of a line given two points or its graph whether the slope is positive, negative or undefined or the line is vertical or horizontal.

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Lines - Cool math Algebra Help Lessons - Finding the Slope of a Line from the Graph

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This algebra lesson explains how to find the slope of a line by looking at its graph.

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Finding the slope of a line from its graph | Algebra I | Khan Academy