Types of Linear Equations

Identifying Lines

Parallel Lines

  • Parallel lines are always the same distance apart and never meet
  • They will NEVER intersect
  • They have the SAME slope (y-intercept does not matter)
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Perpendicular Lines

  • Perpendicular lines form ninety degree angles
  • They will intersect exactly once
  • Their slopes are the negative reciprocal of each other (y-intercept still does not matter)
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  • These lines intersect, but do not form ninety degree angles.
  • Their slopes are unrelated to each other.