The midpoint of a line segment is located at (1 -2). If one of the endpoints is (3, 9) , what is the other endpoint? Express your answer as an ordered pair.
+36916 From 3 to 1 is a distance of 2 go 2 more to x = -1
from 9 to -2 is a distance of 11 go 11 more to y = -13
