Straight Line and Pair of Straight Lines 1 Question 46

46. If a,b and c are in AP, then the straight line ax+by+c=0 will always pass through a fixed point whose coordinates are (…) .

(1984,2M)

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Solution:

  1. Since, a,b,c are in AP.

2b=a+c

or a2b+c=0 which satisfy ax+by+c=0

ax+by+c=0 always pass through a fixed point (1,2).



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