Asked by jessie

Point A(-10,10) is the midpoint of segment BD. If the coordinate of B are (2, -4), then what are the coordinates of D?
Answered by oobleck
Since A is the midpoint,
A = (B+D)/2
D = 2A-B
So, for the x-coordinate, that is 2(-10)-2 = -22
Check: -10 is halfway from -22 to 2 (12 from each end)
Now do y
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