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Khan Academy
Khan Academy: Algebra: Slope of a Line 3
This video demonstrates how to find the slope of two points that when graphed create a vertical line. The video uses the slope formula to demonstrate that the slope of a vertical line is zero. [5:05]
Khan Academy
Khan Academy: Slope: Slope of a Line 3
This video demonstrates how to find the slope of two points that when graphed create a vertical line.