Equations of straight lines are in the form y = mx + c (m and c are numbers). m is the gradient of the line and c is the y-intercept (where the graph crosses the y-axis).
        
                    
             
        
        
        
Answer:
(2,21)
Step-by-step explanation:
y = 10.5x
plug 2 for x  in the equation 
y = 10.5(2)
then multiply 2 by 10.5
y=21
 
        
             
        
        
        
Answer:He can bring up 13.8333333333 boxes each trip
Step-by-step explanation:
970-140= 830
830÷60=13.8333333333