You take the first equation and make a value for y. So 6x + y =7 change it to :
y = -6x + 7
Now in the second equation replace the “y” with -6x +7 this is what it means to use substitution method . Your combined equation will now be :
8x + 9(-6x + 7) =17
Now do distributive property and you get :
8x + -54x +63 =17
Now combine like terms ;
-46x +63 =17
-46x =-46
x = 1
Now replace 1 for X value and we can get the value of Y . 
Y=1 
X=1
        
             
        
        
        
Answer:
83 
Step-by-step explanation:
The total angle of a flat line is 180. If you subtract the angle of 2 from 180 you get 83 which is the angle of 1. 
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
1. your kinda doing the same thing
2. solving problems is somewhat like math
3. you solve problems in math
 
        
                    
             
        
        
        
Answer:
we need an image in order to answer the question