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heyitslizzy13

  • one year ago

can anyone help with with parts b, c, and d please?(:

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  1. heyitslizzy13
    • one year ago
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  2. phi
    • one year ago
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    part b wants you to find the equation of a line. Its first point is at x=0 what is the y value when x is 0?

  3. heyitslizzy13
    • one year ago
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    995?

  4. phi
    • one year ago
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    yes, so the first point is (0,995) you now want the point at x=8. you can read it off the graph what is it ?

  5. heyitslizzy13
    • one year ago
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    (8,1464)

  6. phi
    • one year ago
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    now we have two poins (0,995) and (8,1464) the starting point is the equation y= m x + b we need to find m. m is the slope, and slope is change in y divided by change in x can you find the slope between these two points?

  7. phi
    • one year ago
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    change in y is 1464-995 = ?

  8. heyitslizzy13
    • one year ago
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    yes okay I got 469/8 for the slope :)

  9. phi
    • one year ago
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    ok, now use the first point (0,995) y = (469/8) x + b replace y with 995 and x with 0 what do you get ?

  10. heyitslizzy13
    • one year ago
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    b=995?

  11. phi
    • one year ago
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    yes. (we could have use the other point and we would get the same answer for b... but it would be harder arithmetic) anyways, y= (469/8) x + 995

  12. heyitslizzy13
    • one year ago
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    wow, okay thanks :)) can you explain part c to me please?

  13. phi
    • one year ago
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    the slope of that line is the average "change in sales" per year from 2000 to 2008

  14. phi
    • one year ago
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    can you do part D?

  15. heyitslizzy13
    • one year ago
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    i'm not sure how to

  16. phi
    • one year ago
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    they want you to find y using your equation what x value should we use to get 2010 ? any idea ?

  17. heyitslizzy13
    • one year ago
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    10!

  18. heyitslizzy13
    • one year ago
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    so just plug it into the equation and get my answer?(:

  19. phi
    • one year ago
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    yes. I would change the slope to a decimal, multiply by 10 then add 995 then round to the nearest whole number.

  20. heyitslizzy13
    • one year ago
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    thanks so much!

  21. phi
    • one year ago
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    what did you get ?

  22. heyitslizzy13
    • one year ago
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    $1581.25 million

  23. phi
    • one year ago
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    yes. and because all the other numbers in the graph are whole numbers it makes sense to round to 1581. (you can make a note that you rounded it, in case your teacher wonders) I would say it is a reasonable estimate because the graph of the points is roughly a straight line (the dots are not scattered all over the place) and we are only estimating 2 years into the future. (it would be less reasonable to estimate say 20 years into the future)

  24. heyitslizzy13
    • one year ago
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    ok, thanks! :)

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