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October 30th, 2012, 09:56 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, 03:27 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,154 Thanks: 1421 
The line has equation ax + (a + d)y + a + 2d = 0, which is satisfied by (x, y) = (1, 2).


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