SOLUTION: Find the slope of the line that contains (-1,9) and (-1, 1)

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Question 415805: Find the slope of the line that contains (-1,9) and (-1, 1)
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

slope of line = 9-1 / -1 +1 = 8/0 = not defined...

so, line is parallel to y axis ,
slope = tan90 =not defined