That the slopes of the lines are the opposite of each other and negative.
Ex: y=2/3x+b then the line perpendicular to it is y=-3/2+b
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These lines are perpendicular: _|
Lines that aren't perpendicular
PERPENDICULAR
perpendicular.
Obviously it can.The type of lines that are perpendicular but do not intersect are known as 'Skew' lines. These can be better understood by using vectors in three-dimensional.I have reason to think that you yourself, do not know what your asking for and therefore I must tell you this. 90degrees= perpendicular.