Which of the equation represents the pair of perpendicular straight li

1.	Which of the equation represents the pair of perpendicular straight lines
A.	\[{{y}^{2}}+xy-{{x}^{2}}=0\]
B.	\[{{y}^{2}}-xy+{{x}^{2}}=0\]
C.	\[{{x}^{2}}+xy+{{y}^{2}}=0\]
D.	\[{{x}^{2}}+xy-2{{y}^{2}}=0\]
Answer» B. \[{{y}^{2}}-xy+{{x}^{2}}=0\]

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Which of the equation represents the pair of perpendicular straight lines

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