Answer:
Step-by-step explanation:
Given points:
- A(-1, -9) and M(0.5, -2.5)
Let the coordinates of B are (x, y)
Use midpoint formula to determine the point B:
- 0.5 = (- 1 + x)/2 ⇒ 1 = -1 + x ⇒ x = 1 + 1 = 2
- -2.5 = (-9 + y)/2 ⇒ -5 = -9 + y ⇒ y = -5 + 9 = 4
