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MHT CET2010MathematicsPair of Lines

The angle between the lines x²-x y-6 y²-7 x+31 y-18=0 is

Options

  1. A4
  2. B6
  3. C2
  4. D3

Correct answer

A. 4

Step-by-step solution

Given equation is x²-x y-6 y²-7 x+31 y-18=0 Here, a=1, b=-6, h= -1 2 = ⁻¹ | 2 (- 1 2 )²-1 (-6) 1+(-6) |= ⁻¹ | 2 1 4 +6 -5 |= ⁻¹|-1|= 4

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