find the slope, if it exists, of the line containing the pair of points. (7,3) and (-8,3)

Hey Andrew! Slope is "rise over the run". (7,3) is 3' high; (-8,3) is 3' high, too. No rise, no slope - flatline :)

find the slope, if it exists, of the line containing the pair of points. (7,3) and (-8,3)

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The correct answer is zero.