Explanation:
If the points are (-1/2, 1/2) and (-2/1, 2/1) then you can enter these into the Slope equation
(y1 - y2) / (x1 - x2)
1/2 - 2/1 = 1/2 - 4/2 = - 3/2 or - 1.5
-1/2 - (-2/1) = - 1/2 + 4/2 = 3/2 or 1.5
So your Slope is -1.5/1.5 = - 1
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