Does this help you at all?
 
        
        
        
Answer:0.0064516129
Step-by-step explanation:
 
        
             
        
        
        
Answer:
easey, sub them
(x,y)
see if true
(0,1), 2(0)+1>-4, 1>-4, true
(4,-12), 2(4)+-12>-4, 8-12>-4, -4>-4, false
(5,-12), 2(5)+-12>-4, 10-12<-4, -2>-4, true
(-1,-1), 2(-1)+-1>-4, -2-1>-4, -3>-4, true
(-3,0), 2(-3)+0>-4, -6>-4, false
answers are
(0,1)
(5,-12)
(-1,-1)
Hopefully that helped you a little bit :)
 
        
             
        
        
        
K = LMN
We divide both sides by LN:-
M = K / LN
        
             
        
        
        
Answer:

 Not a function.
Step-by-step explanation:
The given function is;

Let 
Interchange x and y;

Solve for y;

Square both sides




The inverse is 

 is not a function because one x-value maps onto to different y-values.
 is not a function because one x-value maps onto to different y-values.