If we let the number of flip-flops be x in the equation and that the cost would be y ( in terms of x) and the income would be z ( in terms of x), these equations will likely intersect each other during breakeven. That is, when the total revenue that the company will gain from sales of the flip-flops just be equal with the total cost. 
        
             
        
        
        
Answer:
(-2,0)
Step-by-step explanation:
To find the x intercept, set y =0 and solve for x
9x+3y = -18
9x +0 = -18
9x/9 = -18/9
x = -2
(-2,0)
 
        
             
        
        
        
Answer:
wdym what solution put the equation down so I can answer it 4 u
 
        
                    
             
        
        
        
my guess would be c. but id wait for someone else to answer just to be sure