Answer:
If y varies inversely as x, then we write it as:
y = k/x
where k is some constant.
If we multiply both sides of this equation by x we get an equation for k:
k = x*y
We are given that y=4 when x=7, therefore:
k = 7*4 = 28
Put this back into our original equation to get:
y = 28/x
 
        
             
        
        
        
Answer:
Answer is b or 10. 
Step-by-step explanation:
The reason for this is that you will just plug in all the answers in x and the answer has to match 15. 
So...
2(10) - 5 = 15
15 = 15
This is true so the answer is 10. 
If this helped you then please check out or subscribe to The Game Rater. Thanks I really appreciate it.
 
        
                    
             
        
        
        
Answer:
-3 every time
Step-by-step explanation: