heyitslizzy13
  • heyitslizzy13
can anyone help with with parts b, c, and d please?(:
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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heyitslizzy13
  • heyitslizzy13
phi
  • phi
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?
heyitslizzy13
  • heyitslizzy13
995?

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phi
  • phi
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 ?
heyitslizzy13
  • heyitslizzy13
(8,1464)
phi
  • phi
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?
phi
  • phi
change in y is 1464-995 = ?
heyitslizzy13
  • heyitslizzy13
yes okay I got 469/8 for the slope :)
phi
  • phi
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 ?
heyitslizzy13
  • heyitslizzy13
b=995?
phi
  • phi
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
heyitslizzy13
  • heyitslizzy13
wow, okay thanks :)) can you explain part c to me please?
phi
  • phi
the slope of that line is the average "change in sales" per year from 2000 to 2008
phi
  • phi
can you do part D?
heyitslizzy13
  • heyitslizzy13
i'm not sure how to
phi
  • phi
they want you to find y using your equation what x value should we use to get 2010 ? any idea ?
heyitslizzy13
  • heyitslizzy13
10!
heyitslizzy13
  • heyitslizzy13
so just plug it into the equation and get my answer?(:
phi
  • phi
yes. I would change the slope to a decimal, multiply by 10 then add 995 then round to the nearest whole number.
heyitslizzy13
  • heyitslizzy13
thanks so much!
phi
  • phi
what did you get ?
heyitslizzy13
  • heyitslizzy13
$1581.25 million
phi
  • phi
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)
heyitslizzy13
  • heyitslizzy13
ok, thanks! :)

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