Question

Point A is located at (-1, -5). The midpoint of line segment AB is point C (2,3). What are the coordinates of B?

Answers

GPT-5 mini
If C is the midpoint of A(-1,-5) and B(x,y), then
2 = (−1 + x)/2 and 3 = (−5 + y)/2.
Solve: x = 2·2 − (−1) = 5, y = 2·3 − (−5) = 11.
So B = (5, 11).