A relation machine accepts x-value numbers, performs the operation indicated by the relation, and spits out the y-value answer.  Given the following relation machines, find the y-values that will be spit from the machine and determine if the relation is actually a function for the x-values given.
 
Feed in these x-values Spit out the y-value answers Is it a function for these x-values?
1.   x = -3, -2, -1, 0, 1, 2, 3   y =  

 

Feed in these x-values Spit out the y-value answers Is it a function for these x-values?
2.     y =  

 

 

Feed in these x-values Spit out the y-value answers Is it a function for these x-values?
3.   x = -2, -1, 0, 2, 7   y =  

 

 

Feed in these x-values Spit out the y-value answers Is it a function for these x-values?
4.   x = 4, 8, 13, 20   y =