Explanation:
The coordinates of the midpoint are the average of the endpoints.
40. Endpoint (-8, 11), and midpoint (-6, 9).
-6 = (x + -8) / 2
-12 = x − 8
x = -4
9 = (y + 11) / 2
18 = y + 11
y = 7
The other endpoint is at (-4, 7).
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