Gaokao Math Practice Question
6. (5 分) 圆 $x^{2}+y^{2}-2 x-8 y+13=0$ 的圆心到直线 $a x+y-1=0$ 的距离为 1 , 则 $a=($
- A.$-\frac{4}{3}$
- B.$-\frac{3}{4}$
- C.$\sqrt{3}$
- D.2
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