Question

The midpoint of AB is M(-2, 0). If the coordinates of A are (1, -7), what are the

coordinates of B?

Answer 1

B 5,7

Explanation:

Endpoint B (x,y) (missing therefore I called them x and y)

endpoint A (1,-7)

midpoint M (-2,0)

use your midpoint formula:

x1+x2 , y1+y2

¯¯2¯¯¯ ¯¯2¯¯

(x+1)/2 = -2 (mulitply the 2 on both side )

x+1 = -4 (subtract 1 on both side)

x = -5

(y+-7)/2 = 0 (mulitply the 2 on both side )

y-7 = 0 (add 7 on both side)

y = 7

Endpoint B (-5,7)