Midpoint of segment

Point A has coordinates [-16; 23] and the midpoint of the segment AB is the point [2; 12]. What are the coordinates of point B?

Correct result:

x =  20
y =  1

Solution:

M=A+B2 2M=A+B B=2M−A  x=2⋅2−(−16)=20
y=2⋅12−23=1

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