Points: (-2, 3) and (1, 1)
Slope: -2/3
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The line is vertical and so the slope is undefined.
Points: (1, 2) and (3, 8) Slope: 3
The slope is -2/3.
Points: (1, -1) and (5, -7)Slope: -3/2
Points: (2, 5) and (-1, 5) Slope: 0 and so therefore it has no slope but is a straight line parallel to the x axis