Question 697905
find the slope of the line through the pair of points. a(2,-3),p(2,9)
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slope = (9--3)/(2-2) = 12/0 , which is undefined.
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Note: If you plot the 2 points and draw a line thru them,
you will see that the line if vertical.  It has equation x = 2.
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Cheers,
Stan H.