A line segment has one endpoint at (6, 8) and midpoint at (-1, -1). What is the sum of the coordinates of the other endpoint?
+240 The formula of a midpoint of two points is just the average of the x, the average of the y.
((6+x)2,(8+y)2)=(−1,−1)6+x=−28+y=−2x=−8y=−10
-8 + -10 = -18
