Pls help I do not understand this question at all

Answer:
A) The one-time charge for entering the parking lot.
Step-by-step explanation:
The y-intercept of a linear slope equation is “b” (4.50 in this equation). Since you have to pay to get into the parking lot, that would be the y-intercept cost since it wouldn’t be $0.
3x, which is the slope, would be the amount paid after x amount of hours.
Hope this helps :)