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jayda

  • one year ago

The scatter plot below shows the weights in ounces of several kittens at various ages. What is the best equation of the trend line through these points? A. y = 10x B. y = 4x C. y = 1/4x + 10 y = 4x + 10

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  1. jayda
    • one year ago
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  2. mathmate
    • one year ago
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    This is how you proceed for slope-intercept equations. From the graph, read off the y-intercept (=10). Read off the slope (about 15). Check the 4 options to see which one satisfies both conditions. If you can use help reading off the slope and intercept, please post.

  3. jayda
    • one year ago
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    what do you mean

  4. mathmate
    • one year ago
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    Are you familiar with how to find the y-intercept of a given equation in slope-intercept form?

  5. jayda
    • one year ago
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    not really

  6. mathmate
    • one year ago
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    An equation y=mx+b is in slope-intercept form, where m=slope and b=y-intercept. |dw:1357747417191:dw|

  7. mathmate
    • one year ago
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    @jayda ok so far?

  8. jayda
    • one year ago
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    yes

  9. mathmate
    • one year ago
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    From the given graph, can you spot the y-intercept?

  10. jayda
    • one year ago
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    would it be 1?

  11. mathmate
    • one year ago
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    no. Y-intercept is where the curve (line in this case) intersects the y-axis. Can you read it off?

  12. jayda
    • one year ago
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    so the y intercept is where you have the curved line?

  13. mathmate
    • one year ago
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    |dw:1357748329385:dw| Can you figure out the y-intercept of the given graph?

  14. jayda
    • one year ago
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    ohh . okay . yes

  15. mathmate
    • one year ago
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    can you do the rest now?

  16. mathmate
    • one year ago
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    What is the approximate slope and what is the intercept?

  17. jayda
    • one year ago
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    isnt the intercept 10 though?

  18. jayda
    • one year ago
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    @mathmate ?

  19. mathmate
    • one year ago
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    Right, y-intercept is 10. Did you find the slope?

  20. jayda
    • one year ago
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    would it be 4?

  21. jayda
    • one year ago
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    would the answer be D?

  22. mathmate
    • one year ago
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    Your answer D is correct. You have eliminated A and B because the y-intercepts there are zero. Good job. Between C and D, the difference is the slope. The graph shows that y increases from 10 to 14 between 0 and 1. This implies a slope of (14-10)/(1-0)=4. Therefore answer D is correct.

  23. jayda
    • one year ago
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    thank you so much ! (:

  24. mathmate
    • one year ago
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    yw! :)

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