Question

The table below shows the consumer price index (CPI) every two years from 1980 through 1998...

Answer 1

I got y=4.467x-8760.425

Answer 2

I got y = 4.467x + 84.775
I think you might have used the wrong x-values. Did you use the years, or 0, 2, 4, ...
Are you doing this by hand?

Answer 3

oh i used years that might have been the problem, I am using a ti-84 and I did get y = 4.467x + 84.775 but I put y=4.467x-8760.425 because I used the years.

Answer 4

ok yeah that's what it was

Answer 5

I am just wondering why do you have to use 0, 2, 4, etc. instead of the years?

Answer 6

for ease basically. The data only starts from 1980, if you're resetting that as "year 0". Keeping the years makes the data look smaller

Answer 7

Thank you, I have another problem, would you mind looking at it, I can will open another question, I have answers to it but im not sure if there right.

Answer 8

yeah no problem

Answer 9

Ok I see it now that makes more sense.