Question 674402
slope = {{{(y1-y2)/(x1-x2)}}}
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slope = {{{(7--10)/(10-8) = 17/2}}}
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slope = {{{(-2-0)/(-3--3) = -2/0}}} slope undefined; vertical line
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slope = {{{(3-3)/(-6-5) = 0/-11}}} no slope; horizontal line
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