Parallel, Perpendicular, or Neither
View the Lesson | MATHguide homepage Updated June 22nd, 2023

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Given:Points A(4, 8), B(9, 12), C(-1, -1), D(4, 3)
  
Slope Formula
  
Problem:Calculate the slopes of line AB and line CD to determine if they are parallel, perpendicular, or neither.
mAB =  
mCD =  
 
Characteristic: