Answer:
is A
Step-by-step explanation:
 
        
             
        
        
        
A. (4, -7) Is the correct answer! 
2 x 4 = 8    8 - 15 = -7   True!
4 x 4 = 16    3 x -7 = -21     16 + -21 = -5    True!
Since both statements are true, this is the solution to the system.
 
        
                    
             
        
        
        
Answer:
<h2>X = M/9</h2>
Step-by-step explanation:
M = 10x - x
M= 9x
X = M/9