Divide both sides by -3  and the answer s=-2a + 30
        
             
        
        
        
Answer: 15 miles per gallon
Step-by-step explanation:
135 divided by 9
 
        
                    
             
        
        
        
A proportional relationship is just a linear relationship where b = 0, or to put it another way, where the line passes through the origin (0,0).
 
        
                    
             
        
        
        
The answer to your question is B