Which of the following second degree equation represented a pair of st

1.	Which of the following second degree equation represented a pair of straight lines [MP PET 1990]
A.	\[{{x}^{2}}-xy-{{y}^{2}}=1\]
B.	\[-{{x}^{2}}+xy-{{y}^{2}}=1\]
C.	\[4{{x}^{2}}-4xy+{{y}^{2}}=4\]
D.	\[{{x}^{2}}+{{y}^{2}}=4\]
Answer» D. \[{{x}^{2}}+{{y}^{2}}=4\]

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Which of the following second degree equation represented a pair of straight lines [MP PET 1990]

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