Midpoint : (6,1)
Point A : (4,8)
Point B (xb,by)
Midpoint (xm, my)=( x1+x2) /2 , ( y1+y2)/2
So:
xm= 6 = (4+xb) /2
6 = (4+xb) /2
Solve for xb
6 x 2 = 4+ xb
12 = 4+xb
12-4 = xb
8 = xb
For Yb:
my= 1 = (8+yb) /2
1 = (8+yb) /2
Solve for yb
1(2) = 8+yb
2 = 8+ yb
2-8 = yb
-6 = yb
Coordinate of B = (xb,yb) = (8,-6)
