Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumThe lines $ax^2+2hxy+by^2=0$ are at right angles if
- A$a+b=0$
- B$a+b=1$
- C$h^2-ab=0$
- D$a=b$
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DifficultMHT CET 2023
View SolutionIf $ax^2+6xy+by^2-10x+10y-6=0$ represents a pair of perpendicular lines,then the value of $|a|$ equals
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