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)}

Please help :(

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)}

Please help :(

marziman · Answer

That's .20 gallons ever 60 seconds.  The can is 8 gallons to start.  That should eliminate all 3 choices.

marziman · Answer

Except for one.

marziman · Answer

Which do you think it is?

argymnast · Answer

Is it {(8.0, 1), (7.8, 2), (7.6, 3)} ?

phi · Answer

they say 
volume of water in the can in gallons (y)

in other words,  the gallons is the *second* number

which choices show the gallons as the 2nd number in the (x,y) pairs?
any idea ?