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

- heyitslizzy13

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

- katieb

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- heyitslizzy13

##### 1 Attachment

- 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

995?

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- 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

(8,1464)

- 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

change in y is 1464-995 = ?

- heyitslizzy13

yes okay I got 469/8 for the slope :)

- 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

b=995?

- 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

wow, okay thanks :)) can you explain part c to me please?

- phi

the slope of that line is the average "change in sales" per year from 2000 to 2008

- phi

can you do part D?

- heyitslizzy13

i'm not sure how to

- phi

they want you to find y using your equation
what x value should we use to get 2010 ?
any idea ?

- heyitslizzy13

10!

- heyitslizzy13

so just plug it into the equation and get my answer?(:

- phi

yes. I would change the slope to a decimal, multiply by 10 then add 995
then round to the nearest whole number.

- heyitslizzy13

thanks so much!

- phi

what did you get ?

- heyitslizzy13

$1581.25 million

- 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

ok, thanks! :)

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