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I don't understand this question and sorry but don't mind the other scrap work

I don't understand this question and sorry but don't mind the other scrap work-example-1

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You are supposed to approximate the point at x=21 using the graph given. We can find that the slope of the given line is 2/6 or 1/3 because slope is rise/run or Δy/Δx. Using the point (18, 6) and the slope 1/3 we can determine that the answer would be 7 teaspoons.
User Tim Biegeleisen
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