Midpoint of segment

Point A has coordinates [4; -11], and the midpoint of segment AB is point [17; -7]. What are the coordinates of point B?

Correct answer:

Bx =  30
By =  -3

Step-by-step explanation:

A=(4,11) S=(17,7) S=A{+B}{2} 2 S=A+B B=2SA  Bx=Bx=2 SxAx=2 174=30

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