Question

The midpoint of AB is M(3,-1).If the coordinates of A are (8,4) what are the coordinates of B

Answer 1

B(-2,-6)

Explanation:

The midpoint of AB is M, then A(8,4), M(3,-1)

So we can find:

`x_(B) =2x_(M) -x_(A)= 2*3-8= -2\\y_(B)= 2y_(M) -y_(A) = 2*(-1)- 4= -6\\`

then B(-2,-6), hope that useful.