Ok y is your y value from any point on the graph m is your slope x is the x value of any point from the graph and b is your y intercept that is where the line cross in the y line that is the vertical line in the graph
 
        
                    
             
        
        
        
4n(-2)=(5)(-2)
-8n=-10
—— —-
 -8 -8
n= 5/4
n= 1 1/4
So the final answer is n= 1.25