Answer:
y=3x-7
Step-by-step explanation:
 
        
             
        
        
        
Let's call x1: The rate per hour of the number one mechanic. X2: The rate per hour of mechanic number two. The first thing you should do is identify the system of equations that best describes the problem. In this case it is a system of 2 equations with two unknowns which when solved gives a total of x1 = 85 $ / h and x2 = 50 $ / h. Attached solution.
 
        
        
        
Answer:
5
Step-by-step explanation:
-6+2n=3n-(6+5)
-6+2n=3n-11
-6+2n-3n=-11
-6-n=-11
n=-6-(-11)
n=-6+11
n=5
 
        
             
        
        
        
Mike is driving 20 miles per hour
If he is driving 10 miles in 30 mins 
(1/2 an hour) if you times both by two it tells you the MPH that Mike is driving.