Answer:
Very certain it is C 
Step-by-step explanation:
There are no points on the graph line itself so I cannot really confirm this but i am 70% sure 
 
        
             
        
        
        
Answer: y=8.5x + 25.5
Step-by-step explanation:
y=mx+b
b= beginning number so thats 
25.5 you start there
m= its slope so its 8.5 
 
        
             
        
        
        
Answer:
8v + 3.
Step-by-step explanation:
1/8 * 64v  + 1/8 * 24
 
        
                    
             
        
        
        
Point are set up (x,y) you sub the number for x into the equation and see if you get the number for y.
y=4x+3
y=4 (5)+3
y=20+3
y=23
so A isn't the answer 
y=4 (17)+3
y=68+3
y=71
B isn't the answer 
y=4 (4)+3
y=16+3
y=19
and because 4 is the x value for c and d and there can only be 1 y value for each x you're answer is C because when x=4 y =19 or (4,19)