A) \[{{x}^{2}}-xy-{{y}^{2}}=1\]
B) \[-{{x}^{2}}+xy-{{y}^{2}}=1\]
C) \[4{{x}^{2}}-4xy+{{y}^{2}}=4\]
D) \[{{x}^{2}}+{{y}^{2}}=4\]
Correct Answer: C
Solution :
We have to check for each equation separately. Option (d) cannot be because it is a circle. Considering option (a)\[\Delta \ne 0,\ \]option (b)\[\Delta \ne 0\]and for option (c)\[\Delta =0\].
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