The two circles \[{{x}^{2}}+{{y}^{2}}-2x+6y+6=0\]and \[{{x}^{2}}+{{y}^{2}}-5x+6y+15=0\]touch each other. The equation of their common tangent is [DCE 1999]

The two circles \[{{x}^{2}}+{{y}^{2}}-2x+6y+6=0\]and \[{{x}^{2}}+{{y}^

1.	The two circles \[{{x}^{2}}+{{y}^{2}}-2x+6y+6=0\]and \[{{x}^{2}}+{{y}^{2}}-5x+6y+15=0\]touch each other. The equation of their common tangent is [DCE 1999]
A.	\[x=3\]
B.	\[y=6\]
C.	\[7x-12y-21=0\]
D.	\[7x+12y+21=0\]
Answer» B. \[y=6\]

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The two circles \[{{x}^{2}}+{{y}^{2}}-2x+6y+6=0\]and \[{{x}^{2}}+{{y}^{2}}-5x+6y+15=0\]touch each other. The equation of their common tangent is [DCE 1999]

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