Red is the positive integers and blue is the negative integer.
 
        
             
        
        
        
Answer:
2) 

collect like terms 

move the constant to the right hand side and change its sign.

Subtract the numbers 

Divide both sides of the equation by 8

 
        
             
        
        
        
Answer:
<h2>3x + y = 1</h2>
Step-by-step explanation:

 
        
                    
             
        
        
        
So to start you need to add 7 and 4 to get 11 
Then you divide 1650mL by 11 which gets you 150mL
You then times that by 7 to get the ratio of blue paint which is 1050mL and times 150mL by 4 to get the ratio of red paint which is 600mL