The equation `12x^(2)+7xy+ay^(2)+13x-y+3=0` represents a pair of perpe – InterviewSolution

1.	The equation `12x^(2)+7xy+ay^(2)+13x-y+3=0` represents a pair of perpendicular lines. Then, the value of a isA. `(7)/(2)`B. `-19`C. `-12`D. 12
Answer» Correct Answer - C Comapring the given equation with standard eqution, we get `a=12 and b=a` , for perpendicular lines coefficient of `x^(2)+` coefficient of `y^(2)=0` `:. 12+a=0` `rArr a=-12`

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