pair-st-lines

Question: Condition that the two lines represented by the equation $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$to be perpendicular is



1) $ab=-1$
2) $a=-b$
3) $a=b$
4) $ab=1$
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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