A) \[{{y}^{2}}-4y-21=0\]
B) \[{{y}^{2}}+4y-21=0\]
C) \[{{y}^{2}}-4y+21=0\]
D) \[{{y}^{2}}+4y+21=0\]
Correct Answer: A
Solution :
Let the lines are \[y={{m}_{1}}x+{{c}_{1}}\] and \[y={{m}_{2}}x+{{c}_{2}}\] since pair of straight lines parallel to x-axis, \\[{{m}_{1}}={{m}_{2}}=0\] and the lines will be \[y={{c}_{1}}\]and \[y={{c}_{2}}\] Given circle is \[{{x}^{2}}+{{y}^{2}}-6x-4y-12=0\], centre (3, 2) and radius = 5.You need to login to perform this action.
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