Answer:
A -1.
Explanation:
Using the slope formula for 2 points:
The slope = ((c + d) - (c - d) / (c - d) - (c + d))
= 2d / -2d
= -1.
Answer A
slope= (c+d-(c-d))/(c-d-(c+d))=2d/(-2d)=-1
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