Question

已知一条直线经过A(2,5),B(x,y),且(x-2)^2+(y+5)^2=0则直线斜率

Answer 1

(x-2)^2+(y+5)^2=0

则：x-2=0,y+5=0

得：x=2,y=-5

所以,B(2,-5)

则直线的斜率不存在.