5 units (extra characters......)
        
                    
             
        
        
        
The equation in slope intercept for is y = 5/2x + 4 
The y intercept is 4
        
             
        
        
        
5+3=8
Every time you draw, its minus one from denominator
1st marble red: 5/8
2nd marble green: 3/7
        
             
        
        
        
Each bottle costs seven dollars. Two of them would cost $14 and three would cost $21. Buying three bottles, the amount is $21 which exceeds $16. Therefore, a $5 discount will be given. Subtracting $5 from the $21 will give $16. You have just enough amount to buy THREE bottles of olive oil.