If a, b, c are in A.P., prove that the straight lines ax+2 y+1=0, bx+3 – InterviewSolution

1.	If a, b, c are in A.P., prove that the straight lines ax+2 y+1=0, bx+3 y+1=0 and cx+4 y+1=0 are concurrent.
Answer» If a, b, c are in A.P., prove that the straight lines $a x + 2 y + 1 = 0, b x + 3 y + 1 = 0$ and $c x + 4 y + 1 = 0$ are concurrent.

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