The equation \[{{x}^{2}}-16xy-11{{y}^{2}}-12x+6y+21=0\] represents

1.	The equation \[{{x}^{2}}-16xy-11{{y}^{2}}-12x+6y+21=0\] represents
A.	Parabola
B.	Ellipse
C.	Hyperbola
D.	Two straight lines
Answer» D. Two straight lines

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The equation \[{{x}^{2}}-16xy-11{{y}^{2}}-12x+6y+21=0\] represents

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