Answer:
Coordinates switch, and the new y-coordinate changes sign
Explanation:
We have point A with the coordinates (-1,2), when we rotate it c90º it becomes (2,1). 
What happened? The coordinates switched and the x-coordinate of A (-1) became the y-coordinate of A' (1) and it changed its sign.
 
        
                    
             
        
        
        
10 equal parts. that is the answer
        
             
        
        
        
Answer:
fna-yzqk-yus
j.o.i.n gi.r.ls to see my d.ic.k and c.u.m.mi.ng
 
        
             
        
        
        
173888888888888888888888888888
        
             
        
        
        
Slope=(y1-y2)/(x1-x2)
(1 - 5)/(3 - -2)=(1 - 5)/(3 + 2)
-4/5
A is the answer