A watering can dispenses water at a rate of 0.35 gallon per minute. The original volume of water in the can was 9 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 the can starts dispensing water?

{(1, 9.0), (2, 8.65), (3, 8.30)}
{(9.0, 1), (8.65, 2), (8.30, 3)}
{(8.65, 1), (8.30, 2), (7.95, 3)}
{(1, 8.65), (2, 8.30), (3, 7.95)}

Question

A watering can dispenses water at a rate of 0.35 gallon per minute. The original volume of water in the can was 9 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 the can starts dispensing water?

 {(1, 9.0), (2, 8.65), (3, 8.30)}
 {(9.0, 1), (8.65, 2), (8.30, 3)}
 {(8.65, 1), (8.30, 2), (7.95, 3)}
 {(1, 8.65), (2, 8.30), (3, 7.95)}

luffingsails · Answer

So, the x value will be time and the y value is the gallons in the can. Which of the two answers would that eliminate?

luffingsails · Answer

Then, remember time is the x value... Time starts at zero... at time zero how much water is in the can?

luffingsails · Answer

Time in the ordered pairs starts at 1 not zero. How much water is in the can at 1 minute?

anonymous · Answer

well that elimintes the bottom two

anonymous · Answer

and if you just put the (x,y) values in the right sides it will give you the answer

luffingsails · Answer

Sorry @mathsciencehistory, my first response eliminates the middle two answers. My second and third eliminate the first answer. The correct answer is the fourth.

anonymous · Answer

oh lo but the bottom two dont even start at 9.0

anonymous · Answer

@iGreen  can you help here

luffingsails · Answer

Right the bottom doesn't start at nine... it starts at 1 second after the can has lost .35 gallons of water.

anonymous · Answer

i just want to learn how to solve these function things

anonymous · Answer

ohk so i get that now i guesss

anonymous · Answer

I can see a bit conflict here and its confusing me a bit

luffingsails · Answer

Right, there are points missing in the data provided. What is the data point at time 0 (zero)?

(0 , 9.0)
(1 , 8.65)
(2 , 8.30)

and so on.

anonymous · Answer

ok i get it now i just assumed it started with nine i forgot there would have to be a zero

luffingsails · Answer

Right... a bit of a trick. Good catch. Hope that helps.

anonymous · Answer

@Luffingsails Thank you lol i was never good at functions though

anonymous · Answer

my mind is set on just getting it done fastly

luffingsails · Answer

Word problems are hard. I understand. Just try to turning sentences into math statements. It gets better!

anonymous · Answer

ok well if you have more emobae post em ill try an help to learn better