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Slope of a Line
Graphs
Slope-Intercept Form
Point-Slope Form
Parallel Lines
Perpendicular Lines
Practice Problems
  PERPENDICULAR LINES
Two non-vertical lines with slopes m1 and m2 are perpendicular if and only if the product of their slopes is -1, that is, if and only if m1 • m2 = -1.

Perpendicular lines
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