Straight Line Question 381

Question: If the straight line $ ax+by+c=0 $ always passes through (1, -2), then a, b, c are [AMU 2000]

Options:

A) In A.P.

B) In H.P.

C) In G.P.

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

  • $ ax+by+c=0 $ is always through $ (1,-2) $ . \ $ a-2b+c=0 $
    Þ $ 2b=a+c $ Therefore, a, b and c are in A.P.

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