You did not include the choices. However, I answered one that just included them. I've included the possible answers below and then the correct answers. 
<span>A multiple of Equation 1. 
B. The sum of Equation 1 and Equation 2 
C. An equation that replaces only the coefficient of x with the sum of the coefficients of x in Equation 1 and Equation 2. 
D. An equation that replaces only the coefficient of y with the sum of the coefficients of y in Equation 1 and Equation 2. 
E. The sum of a multiple of Equation 1 and Equation 2.
</span>A, B and E.
Adding and multiplying the terms allow them to keep working. However, you must make sure that each variable is changed each time. Not just one as in C and D. 
        
                    
             
        
        
        
Answer:
Option B.
Step-by-step explanation:
The given triangle is a right angle triangle.
In a right angle triangle,
 
In the given triangle,
 
 
 
Using Pythagoras theorem, we get
 
 
 
 
Taking square root on both sides, we get
 
 
Therefore, the correct option is B.
 
        
             
        
        
        
Answer:
times -6 
Explanation... 2 x 10-6 x -6=56
                       6 x 10-4=56       
                              
Hope this helps