Question

Please help

Answer 1

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.

Answer 2

(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.