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?
AY=25x
BY=20x + 40
CY=75x
DY=x + 50
EY=50x + 25
AY=25x
BY=20x + 40
CY=75x
DY=x + 50
EY=50x + 25