Answer:y=8
Step-by-step explanation:
 
        
             
        
        
        
Let the time = x
Distance = Speed x time
One train is 75x, the other train 85x
Add together to equal total distance:
75x + 85x = 384
Simplify:
160x = 384
Divide both sides by 160:
x = 384 / 160
x = 2.4 hours
 
        
             
        
        
        
2² - y - 5 = 0 
Evaluate the power.
4 - y - 5 = 0
Calculate the sum or difference.
-1 - y = 0
Move constant to the right side and change its sign. 
-y = 1
Change the signs on both sides of the equation.
y = -1
        
             
        
        
        
Answer:
What are the options?
Step-by-step explanation: