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October 30th, 2012, 09:56 AM   #1
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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.
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November 3rd, 2012, 03:27 AM   #2
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The line has equation ax + (a + d)y + a + 2d = 0, which is satisfied by (x, y) = (1, -2).
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