Question

I am stuck on this one problem, can someone please help me?
in 1993 the life expectancy of males in a certain counrty was 63.2. In 1997, it was 65.5 years. Let E represent the life expectancy in year T and let T represent the number of years since 1993.

Answer 1

so

Answer 2

wat do u want to find

Answer 3

some how I keep getting 57.5, but this does not look right...

Answer 4

Let:
(x,y)
= (E,T)

(0, 63.2)
(4, 65.5)

Do you understand how I got past the first step?

In order to find the gradient of your line, based on previous years.

m = (y1-y2)/(x1-x2)
m= (E1-E2)/(T1-T2)
m = (63.2-65.5)/(0-4)
m = -2.3/-4

m = 23/40

The equation:
y = mx+c can be used, you already know your gradient which is 23/40, and you know a plot on your graph (T,E)

y = mx+c
E = mT+c
65.5 = (23/40)x-4+c
65.5 =-2.3+c
c = 67.8

Your equation is:
E = 23/40T + 67.8

This is not right, but I cannot find my error. Could it be that I have my x and y's round the wrong way?
I didn't think it mattered.

I hope you're asking for an equation of the data.

Answer 5

so would the life expectancy in 2007 67.8? I am not sure, this is why I am asking. but the way you displayed does make some sense

Answer 6

Oh crap, I stuffed the whole thing up, sigh. I am much better working with pen to paper.

Answer 7

Let me try again.

Answer 8

I have done this for the past hour and keep coming up with something different each time.. This should be simple for me, but not this time.. I am sorry

Answer 9

It's fine, let me do it with pen to paper :) Make things easier

Answer 10

Thank you for all your help, I really appreciate it :)

Answer 11

Okay, got it. Your equation is:

E=mT+c

Where E is the life expectancy and T is the time after 1993 and m = 23/40 and c = 63.2

Amatuer mistake, I'm ashamed.

So to determine the life expectancy at 2007 (and 14 years after 1993)

E = mT+c
E = (23/40)x14 + 63.2
E = 8.05 +63.2
E = 71.25

Sorry I took so long.

If you need help on how I got the equation, I'll be happy to go through it with you.

Your E is your Y,
Your T is your X

m = (y1-y2)/(x1-x2)
m = (e1-e2)/(t1-t2)
m = (0-4)/(63.2-65.5_
m = 23/40

I'm sure you know how to get your equation from this point onwards :)

Answer 12

This is what I came up with this last time too. It is ok, I am not much help on this end. You have been such a great help, I am just sorry I have been such a pain with this one... I guess after working it over and over for more than an hour can make you a little crazy (so to speak)

Answer 13

Hehe, not a problem. I should have known, just got my x and y axis mixed around. I should have known. Sorry :P

Anything else I can do for you?
I don't mind helping with you genuinely appreciate the help.

Answer 14

That was the last one I needed help with, but thank you again