Midpoint of segment

Point A has coordinates [4; -11] and the midpoint of the segment AB is the 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+B2 2 S=A+B B=2S−A  Bx=Bx=2⋅ Sx−Ax=2⋅ 17−4=30
By=By=2⋅ Sy−Ay=2⋅ (−7)−(−11)=−3

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