It always helps to draw a picture. Given the information, Segment OF is the center line that is bisecting this angle. 
Since it's bisecting (cutting in half)... we can simply set the two angles equal to each other. 
y+30=3y-50 
-2y+30=-50 
-2y=-80 
y = 40 
C)40.
        
             
        
        
        
Step-by-step explanation:
can u give image PlZzzzz ....
 
        
                    
             
        
        
        
The answer to your question is c
        
             
        
        
        
Answer:
C) x = 1
Step-by-step explanation:
By adding the like terms you get 
-12x + 10 = -10x + 8
then you add 12x to both sides and subtract 8 to both sides and get 
2 = 2x
which then you would divide 2 by 2 and get 1