One question for GR 数学总结（03.01.07-01.12）

Passbyer 2003-01-14 23:54:34

JJ says as following:
4. DS. Line goes through (5,a). Is the slope<0?
1) Line goes through (a,5)
2) Line goes throug (20,a)
【确认】D. 1)可确认斜率为(5-a)/(a-5)=-1 2)可确认斜率为(a-a)/(20-5)=0

How about when a = 5? I think answer would be better if it is B. I am not sure?

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