Y=11x+2 should be you answer for the slope
        
             
        
        
        
638-243 = 395 miles 
rounding up, it would be 400 miles
        
                    
             
        
        
        
ANSWER
For Jamal statement to be true, 

EXPLANATION
The given statement is:
ax + b = a(x + c)
We expand the left hand side to obtain,
ax + b = ax + ac
Subtract ax from from both sides of the equation.
b=ac
We know that, a≠0 , so we can divide through by 'a'.
