Question

The midpoint of AB is M (1,3) . If the coordinates of A are (4,1) , what are the coordinates of B

Answer 1

B(-2,5)

Explanation:

Let B (x,y)

M = ([Xa+Xb]/2 , [Ya+Yb]/2)

(x+4)/2 = 1

x+4 = 2

x = 2-4

x = -2

(y+1)/2 = 3

y + 1 = 6

y = 6-1

y = 5

B (-2,5)