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[Post New] 22 Aug 2010 12:21:48 IST
   Subject: Is x axis and y axis is perpendicular or not because we know condition of perpendicular is m1m2=
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Deepak Aggarwal (3759)

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Two lines are perpendicular if the product of their slopes is -1 or one has a slope of 0 (a horizontal line) and the other has an undefined slope (a vertical line).

Refer: http://en.wikipedia.org/wiki/Slope
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