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Algebra equation question

  1. Sep 8, 2013 #1
    1. The problem statement, all variables and given/known data
    Start with 4 pails of water. Each trip, you gain 2 pails of water. What equation represents number of pails over time


    2. Relevant equations
    N/A


    3. The attempt at a solution
    y = 2x + 4 should be the correct answer.

    But my options are
    y=4x + 2
    y=x/4 + 2
    y=x/2 + 4
    y=3x + 3

    Why is it not 2x + 4?
     
  2. jcsd
  3. Sep 8, 2013 #2

    pasmith

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    The only option consistent with starting with 4 pails is y = x/2 + 4, which makes sense only if a trip takes 4 units of time and x represents elapsed time rather than number of trips. I would suggest rereading the question to see if you've missed something along those lines.
     
  4. Sep 8, 2013 #3
    Here is the word for word question, the only information we get...

    Jack and Jill had 4 pails of water. Each trip up the hill, jack and jill obtain 2 more buckets of water. Which equation represent pails over time?
    Perhaps a type, because I noticed another type later in the homework as well.
     
  5. Sep 8, 2013 #4

    pasmith

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    Homework Helper

    I agree that [itex]2x + 4[/itex] is the only sensible answer, so the question must be wrong.
     
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