1.

Which of the following line is a diameter of the circle \[{{x}^{2}}+{{y}^{2}}-6x-8y-9=0\]

A.            \[3x-4y=0\]                              
B.            \[4x-3y=9\]
C.            \[x+y=7\]                                
D.            \[x-y=1\]
Answer» D.            \[x-y=1\]


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