Answer:
If y varies directly as x^3 and y=36 when x=7, find y if x=4? (Round answer to the nearest hundredth) , find y if x=4 x = 4 . (Round off your answer to the nearest hundredth.)
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The correct answer is D. 37.975. 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x=4
y=1
Step-by-step explanation:
4x=7y+9
4x+y=17
7y+9+y=17
8y=17-9
8y=8
y=1
so 
4x=7*1+9
4x=16
x=16/4
x=4