C. 0
Step-by-step explanation:
Since the slop is rise / run = Y / X,
regardless of the values of X,(Y2 - Y1)= 0, because Y = -2.
(Y2 - Y1) / (X2 - X1) = 0 / (X2 - X1) = 0
in other words the slop is equal to 0.
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