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MHT CET2008MathematicsPair of Lines

The equation 12 x²+7 x y+a y²+13 x-y+3=0 represents a pair of perpendicular lines. Then the value of ' a ' is

Options

  1. A7 2
  2. B-19
  3. C-12
  4. D12

Correct answer

C. -12

Step-by-step solution

Comparing the given equation with standard equation, we get a=12 and b=a , for perpendicular lines coefficient of x²+ coefficient of y²=0 12+a=0 a=-12

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