Question

The midpoint of AB is at (-2.3). If A=(7,-6) , find B.

Answer 1

Midpoint formula is M(x1+x2/2 , y1+y2/2).
M(7+x2/2=-2 , -6+y2/2=3). From here we cross multiply
(7+x2=-2[2] , -6+y2=3[2])
(x2=-4-7 , y2=6+6)
(X2=-11 , y2=12)
(-11,12)

Answer 2

Explanation:

mid point = a+b/2

let b(x,y)

-2 = [7+x]/2 3 = [-6+y]/2

-4 = 7 + x 6 = -6 + y

-11 = x 12 = y

Hence B is at (-11,12)