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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Mar 2008 13:52:58 IST
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since it passes through x-axis it will meet it at (a,0).
now eqn of line perp. to it will be given by ax+by=k
putting (a,0)in this eqn we get k=a^2.
therefore the eqn will be-ax+by=a^2
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