Answer:
y=x/2-5
any function with variables is not linear
try going to desmos graphing calculator and putting your functions in you can easily see which is linear.
 
        
                    
             
        
        
        
Answer:
 -3/2
Step-by-step explanation:
See attached image 
 
        
                    
             
        
        
        
Answer:
9 bookcases.
Step-by-step explanation:
Total number of books = 943
Total number of books placed in one shelf = 22
Total number of shelves in one bookcase = 5
Total number of books displayed in one bookcase = 
Total number of books displayed in one bookcase= 
Total number of bookcase required = 
Total number  of bookcase required = 
So, 880 books can be displayed in 8 bookcases. and for the remaining 63 books we also require one more bookcase. Therefore, the total number of bookcases needed are 9.
 
        
             
        
        
        
What????? Um I’m so sorry I don’t know