Question 857320
 They are not vertices of a triangle but are three points on one line.
y = 1-x
(0,1) , (-2,3) midpoint (-1, 2)
 (0,1) , (2,-1) midpoint (1, 0)

(1, 0), (-1, 2)
They are not vertices of a triangle but are three points on a line.
y = 1-x