Question

A watering can dispenses water at the rate of 0.20 gallon per minute. The original volume of water in the can was 8 gallons. Which set of ordered pairs shows the volume of water in the can in gallons (y), as a function of time in minutes (x), from the first minute after can starts dispensing water?

{(7.8, 1), (7.6, 2), (7.4, 3)}
{(1, 7.8), (2, 7.6), (3, 7.4)}
{(8.0, 1), (7.8, 2), (7.6, 3)}
{(1, 8.0), (2, 7.8), (3, 7.6)}

Answer 1

(x,y) pairs always have the x first

if water leaks out at a rate of 0.2 gallons per minute
after 1 minute the 8 gals will go down to 8-0.2 = 7.8

I would look for a pair (1, 7.8) as part of the answer