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2015-09-18T18:27:51+05:30

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The line  L1  :    x = - y  and  z = 2
                 L2 :  x = y  and  z = 0

       L1 and L2  are in two different 3-d  planes which are  z = 2 and z = 0.

They are in parallel planes and the distance between them is  2 units.  Thus they never intersect.

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