Question

The midpoint of AB is M=(-1, -3). One endpoint is A=(3, -1).

Find the coordinates of the other endpoint, B.
A (3.-1).
M(-1, -3)
B (?, ?).

Answer 1

B(-5, -5)

Explanation:

midpoint((x1 + x2)/2, (y1 + y2)/2)

x-coordinate:

(3 + x)/2 = -1

3 + x = -2

x = -5

y-coordinate:

(-1 + y)/2 = -3

-1 + y = -6

y = -5

B(-5, -5)