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Question 531633: undefined slope; through (-1,3)
Answer by oberobic(2304)   (Show Source):
You can put this solution on YOUR website! An undefined slope only occurs where there is no change in 'x' so the slope would be undefined because you cannot divide by 0.
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That means it is a vertical line. (Recall a horizontal line has slope = 0, which means no change in 'y'.)
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So the line that goes through (-1,3) is a vertical line at -1.
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The equation would be: x = -1.
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It is not a function because there are infinitely many y values for x = -1.
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