Adding 2x to both sides we get
y = 2x
This is direct variation   where the constant is 2. 
        
             
        
        
        
Answer:
expression 
Step-by-step explanation:
expressions DON'T have equal signs but equations do.
 
        
             
        
        
        
Answer:

Step-by-step explanation:
We have the function 
In this case we want to find the value of f0)
To find f(0) you must replace the x in the function with the number 0 and solve as shown below



Therefore
