C and D both have variables because u don’t know what the x stands for 
( I hope this helped)
        
                    
             
        
        
        
Answer:
Length x width
Step-by-step explanation:
Multiply 
 
        
                    
             
        
        
        
Answer:
y=-2+12
Step-by-step explanation:
2ed row shows y int, suing x-x/y-y slope is -2
 
        
             
        
        
        
Answer:
80.48m2
Step-by-step explanation:
I think this is right but it may be wrong.
 
        
             
        
        
        
Answer:
X=3, y=5
Step-by-step explanation:
3x + y = 14 equation 1
y=5 equation 2
3x + 5 = 14.    substitute value of y from equation 2 into equation 1
3x=9
x-3