Multiply equation II by 2 and then add up the equations.
        
                    
             
        
        
        
Find the area and volume of the trapezoids first
        
             
        
        
        
Answer:
144x^2−y^2−169 because ther are no like terms
Step-by-step explanation:
 
        
                    
             
        
        
        
For this case, we have the following expression:

We simplify the expression:
If we add similar terms, taking into account that different signs are subtracted and the sign of the greater one is placed, we have that 
So, we have to:

Answer:
-3x + x + 5 = -2x + 5