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.
undefined slope zero slope positive slope negative slope
Joke Time What do you call a hippo in a phone booth? stuck
What would America be called if we all drove pink cars? A pink carnation