You can double the product of 9 and 4 to get to the product of 9 and 8
        
                    
             
        
        
        
Answer:
<h3>x = 27.5</h3>
Step-by-step explanation:

 
        
                    
             
        
        
        
Answer: See explanation
Step-by-step explanation:
7x - 2(x + 3y) + 3y 
= 7x - 2x - 6y + 3y
= 5x - 3y
Will got 5x + 9y because he didn't multiply the values in the bracket by the minus sign outside the bracket. He multiplied the values by +2 rather than -2. This resulted in the wrong answer that he got. 
 
        
             
        
        
        
Answer:
I don't understand what should i answer. 
The only thing I undrestood was that this is a relation which can be a function.
 
        
             
        
        
        
-7x+12-2x=23+13x
First take away 13x from the right side and put it on the left side adding taking it away from -7x 
-7x(-13x)=-20x
-20x+12-2x=23
then add 2x to -20x
and move 12 to the other side, minus it off of 23
-18x=11
then divide -18x on both sides 
then x=-11/18