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surryyy

  • one year ago

The following graph shows the quantity of pencil sales (s) with respect to the day in August (d) in various office supply stores. Which of the following is most likely to be the equation of the trend line? d= - 20/3s - 20 d = 20/3s - 20 s = -20/3d - 20 s= 20/3d - 20 https://static.k12.com/eli/bb/1211/4_68960/2_33592_16_68976/a96bf17c229e063e24091eb1b909924af9c7c7b4/media/80038125d95831be7597a5f6b289b93a4e2c1562/mediaasset_952313_1.jpg

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  1. phi
    • one year ago
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    in a "normal" graph, the horizontal axis is x and the vertical is y in your graph, what do "d" and "s" correspond to ?

  2. phi
    • one year ago
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    in other words, which of s or d is the "y" ?

  3. surryyy
    • one year ago
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    s is y

  4. phi
    • one year ago
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    ok. the equation of a line in point slope form is y= mx + b so in this case, I would expect to see s= m d + b where m is the slope and b is the y-intercept knowing that, you can cross of two of the choices.

  5. phi
    • one year ago
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    any idea how to decide which of the two remaining choices is the correct answer ? I would use the idea that a line that slopes up and to the right has positive slope

  6. surryyy
    • one year ago
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    would it be d?

  7. phi
    • one year ago
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    what is the slope in choice D ?

  8. surryyy
    • one year ago
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    20/3

  9. phi
    • one year ago
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    yes, and that is positive. that means that line slopes up and to the right which is what we want. (the other choice slopes down)

  10. surryyy
    • one year ago
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    so d is correct right?

  11. phi
    • one year ago
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    yes, D is correct. it has the correct form s= m d + b and it has the correct slope (positive)

  12. surryyy
    • one year ago
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    ty

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