Based on my knowledge, you’d set both equations equal to y, and then set both sides equal to each other then solve. 
y=-5+x
y=-2x-4
-5+x=-2x-4
then solve from there
(this could be completely wrong, so don’t only go by my opinion)
        
             
        
        
        
3 cans = $1.50
1.50
------- = 1 can
3 cans 
1.50
------- = .50
3
1 can = $.50
        
             
        
        
        
Answer:
25
Step-by-step explanation:
Cause math
 
        
                    
             
        
        
        
A) The graph will move up by 4 units