Answer: x=5 y=6
Step-by-step explanation: 6y=3× +21
6y-6=2× +20
Opposite sides of the rectangle are equal 
Substitute 3x +21 into 6y in the second equation. 
        
             
        
        
        
Answer:
Combine like terms for the than you do to other side the multiply last for least you divide both sides
Step-by-step explanation:
 
        
             
        
        
        
Answer:
m = (y - y)/(x - x)
Rise/run
Step-by-step explanation:
 
        
             
        
        
        
Answer:
I believe the answer would be survey seeing as other people would be trying all three and comparing one to the other two