To find an ordered pair, remember that ordered pairs are displayed in the form (x,y). Then, substitute an arbitrary value for x or y and solve for the remaining variable.
Since x represents the amount of days, use for instance x=1 and solve for y:
Therefore, the ordered pair (1,59.82) is a solution to the equation. Since y represents the amount of water in m^3, then, the real-world meaning is that there are 59.82 m^3 of water in the pool in day 1.