True, bc they add up to 180 and are the same size. 
 
        
             
        
        
        
Y = 3x + 4
y = 3x + 7
3x + 4 = 3x + 7
3x - 3x = 7 - 4
0 = 3.....incorrect....this system has no solutions because ur lines are parallel and they never cross.
or look at it this way..
y = 3x + 4
y = 3x + 7
both have slopes of 3...but the y intercepts are different......when this happens, it means the lines are parallel with no solution
        
                    
             
        
        
        
Has infinitely many solutions. 
        
                    
             
        
        
        
Answer:
6) B distributive property 7) B distributive property 8) C associative property 
Step-by-step explanation: