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Slopes of Lines. Section 3-3. Definition of Slope. The slope m of a line containing 2 points with coordinate (x 1 , y 1 ) and (x 2 , y 2 ) is given by the formula:. Postulate 3-2 and 3-3. 2 nonvertical lines have the same slope iff they are parallel.
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Slopes of Lines Section 3-3
Definition of Slope • The slope m of a line containing 2 points with coordinate (x1, y1) and (x2, y2) is given by the formula:
Postulate 3-2 and 3-3 • 2 nonvertical lines have the same slope iff they are parallel. • 2 nonvertical lines are perpendicular iff the product of their slopes is –1.
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