Asap i raised to 15 points so plz and i want clear answer the rental rate for a cement mixer has a flat rate of $40 plus $20 for each day of the 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=x+50

b y=25x

c y=20x+40

d y=50x+25

e y=75x