The rental rate for a cement mixer has a flat rate of $40 plus $20 for each day or rental. The graph shows points representing the total cost of the rental. Which linear equation, in slope-intercept form, that models the total cost of the rental over time? 
A. Y=25x 
B. Y=20x + 40 
C. Y=75x 
D. Y=x + 50 
E. Y=50x + 25
                                             
                                          
                                          
                                        
											