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 October 30th, 2012, 08:56 AM #1 Newbie   Joined: Oct 2012 Posts: 20 Thanks: 0 Please for Straight lines If a,b,c are the first, third and fifth terms of an A.P., then the line ax + by + c =0 represents a family of lines passing through the point _____________; ( a <>0 , b<>0 and c<>0). Please explain method too. Thanks in advance.
 November 3rd, 2012, 02:27 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,047 Thanks: 1618 The line has equation ax + (a + d)y + a + 2d = 0, which is satisfied by (x, y) = (1, -2).

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