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