Answer: The relation is a function.
Step-by-step explanation: Since there is one value of y for every value of x in (-2,4), (3,7), (0,8), (5,8), and (1,6), this relation is a function. 
I hope this helps you out! 
 
        
             
        
        
        
Answer:
Step-by-step explanation 
if my answer is wrong i'm sorry here is a manual on how to do it if its wrong
i think they are right but just in case
Identify the output values. If each input value leads to only one output value, classify the relationship as a function. If any input value leads to two or more outputs, do not classify the relationship as a function.
1 relation 
2 function 
3 relation 
4 function 
i know 4 is right but i don't know about others double check i suggest just in case i think they are right 
 
        
             
        
        
        
3x3x3x3 = 81
x.x.x.x = x^4
2x2x2x2 = 16
B. 81x^4/16
        
             
        
        
        
b^2-4ac<0 b^2-144<0 (b-12)(b+12)<0 
-12<b<12