00:01
So in this problem, we are talking about scientists believing that there's a limit to how long people can live.
00:06
Ultimately, we want to use x as the number of years from 1900.
00:18
And then y is years life expected.
00:27
So y is going to be a linear equation.
00:29
Y equals mx plus b.
00:31
The points that we have are going to be at birth.
00:37
It was 46 years.
00:40
And then at 65, right in 2010, so that was in 110 years later, that increased to 78 .7.
01:00
So with those points, we can then determine the slope.
01:03
So the first slope is going to be a y2, so 78 .7 minus y146 over x2, 110 minus 0.
01:14
So this is going to end up giving us a slope of, let's see, 78 .7 minus 46 divided by 110.
01:30
That's going to be a slope of 0 .297.
01:39
With that, our equation is going to be y equals 0 .297.
01:47
Instead of using y intercept form or slope intercept form, we're going to point slope form right here.
01:53
So that's going to be y minus 46.
01:58
Well, we see that actually the intercept is 046...