Remark You are using the midpoint formula. Instead of finding the midpoint, you are looking for one of the points, so you have to rearrange the formula a little bit.
Givens Midpoint (4,2) One endpoint (6,1)
Object Find the other endpoint.
Formula m(x,y) = (x1 + x2)/2, (y1 + y2)/2)
Solution Find the x value 4 = (6 + x2)/2 Multiply both sides by 2 4*2 = 6 + x2 Subtract 6 from both sides. 8 - 6 = x2 x2 = 2
Find the y value 2 = (1 + y2)/2 Multiply by 2 4 = 1 + y2 Subtract 1 from both sides. 4 - 1 = y2 y2 = 3
