(9,-6),(9,-9)?

Question:find the slope if it exists of the line containing the points

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Answers:
x=9 is the line that contains those points. x=9 is a vertical line and a vertical line has a slope that is UNDEFINED

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m=y+y/x+x
m=-9+-6/9+9
m=-15/18
reduces to m= -3/6
and that reduces to m=-1/3
i think...

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undefined b/c its a verticle line and they dont have slopes

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