Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
EasyThe equation $12x^{2}+7xy+ay^{2}+13x-y+3=0$ represents a pair of perpendicular lines. Then the value of $a$ is
- A$7/2$
- B$-19$
- C$-12$
- D$12$
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