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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