Ineed to know how to answer our eqao exam is coming and im having trouble answering this kind of question. can you explain to me how can i determine the meaning of x and y in words.

I think the answer is for A the explanation is that x represent the amount of time or second that you spend in an elevator and y represent the numbers of floors that the building have.

(0,20)  The elevator is  on floor 20 at time = 0 ( the time you enter the lift)

(20,0)  you have descended to ground floor( 0) and it has taken 20 seconds to get there.