If the lines are in the form y = mx + c, the m values multiplied together should equal -1.
Otherwise, the dot product of the two slope vectors should equal 0.
Chat with our AI personalities
Actually it IS. perpendicular lines have opposite reciprocal slopes and parallel lines have the same slope.
Slopes of line perpendicular to the x-axis are undefined.
Parallel lines have the same slope.
2
-1