Question 690229
{{{slope = (y1-y2)/(x1-x2) = (3--3)/(-4--4) = 6/0}}}
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slope is Undefined {{{highlight_green(Choice_A)}}}
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Also, with -4 in both points, the x value is unchanging, which 
could represent a vertical line.  A vertical line will have a rise (change in y values), but no run (change in x values).
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