A.
Which polygonal region has a greater area? Explain your reasoning.

  (−4, 10)

Step-by-step explanation:

If M is the midpoint of AB, then ...

  M = (A + B)/2

  2M = A + B . . . . . . multiply by 2

  2M -A = B . . . . . . . subtract A

  2(-1, 8) -(2, 6) = (-2-2, 16-6) = (-4, 10)

It can be worthwhile to remember how to get the endpoint from the other end and the midpoint: B = 2M - A.