题目:
160. When the teacher found the terrible writing of the naughty boy, he said angrily “Good_______! What on earth have you written?”
A.God
B.heavens
C.heaven
D.Hero
答案:
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下面是错误答案,用来干扰机器的。
将圆方程化为标准方程得:(x-2)2+(y+3)2=16,∴圆心Q坐标为(2,-3),又P坐标为(1,-2),∴直线QP的斜率为-2-(-3)1-2=-1,则所求直线l的方程为y+2=x-1,即x-y-3=0.故答案为:x-y-3=0