A) \[4y=9\]
B) \[y=3\]
C) \[y=-3\]
D) \[x=3\]
Correct Answer: B
Solution :
\[{{S}_{1}}={{x}^{2}}+{{y}^{2}}-12y+27=0\] \[{{S}_{2}}={{x}^{2}}+{{y}^{2}}-9=0\] The equation of common tangent is \[{{S}_{1}}-{{S}_{2}}=0\Rightarrow -12y+36=0\Rightarrow y=3\].You need to login to perform this action.
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