Plz, answer this question plz! Plz, answer this question plz! Plz, answer this question plz! Plz, answer this question plz!

How do you use the elimination method for this question? explain, because i really want to understand!

Which of the following tables represents exponential functions?

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3