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calculate the slope of the line between the points (9, -8) and (9, 9)

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4 Answers

17/0 is undefined, as is any number that is divided by zero. For the level of mathematics you're in right now, this is the accepted answer.

What you did to get 17/0 is correct but that doesn't equal 0, 0/17 = 0. When you get a 0 in the denominator your slope is undefined.