Jack and Jill had 3 pails of water. Each trip up the hill, Jack and Jill obtained 1 more bucket of water. Which of the graphs below represents Jack and Jill's number of pails over time?

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I was able to access the given link for the graphs.  The correct graph is the one where it started with the number 3.  Since Jack and Jill already had 3 pails at the beginning, their 1st trip up the hill will result to an additional 1 pail, making the total number of pails as 4. And so on. y = 3 + x Where x represents the number of times Jack and Jill went up the hill. 

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