math
posted by Lisa .
Find the other endpoint of a line segment with the given midpoint and one endpoint.
Endpoint: (0, 0); Midpoint: ( 2, 8)

Think on this: x is twice half the x change 0+2 ,or x endpoint is 2*2: x=4
y endpoint is twice the change from end to mid, or 2*(08) or y endpoint is 16
(4,16) 
(0,0), (2,8), (x,y).
20 = x2.
X = 4.
80 = y(8).
Y = 16.