pair-st-lines

Question: The lines represented by the equation $9{{x}^{2}}+24xy+16{{y}^{2}}+21x+28y+6=0$ are



1) Parallel
2) Coincident
3) Perpendicular
4) None of these
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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