00:01
We know that this tractor at times zero had a value of $142 ,000.
00:07
And after 10 years, i believe that it's going to depreciate to $67 ,000.
00:13
And we want to find a linear model that looks like this.
00:18
And we'll have a slope times t plus b.
00:21
So let's find that slope.
00:23
So we want to find the difference in the dependent values over the different.
00:32
In the time and this is in dollars and this is in years so that 67 ,000 minus the 142 ,000 it has dropped down in value $75 ,000 divided by 10 means it's dropped $7 ,500 per year and in fact we're supposed to talk about what the meaning of the slope is the slope being this many dollars per one year means that for every one year increase, we end up, as the year goes up by one, the value of the truck goes down, goes down $7 ,500.
01:17
That's that meaning of that slope.
01:19
You look at the units of the second coordinate divided by the first coordinate.
01:23
So it's dollars per year that it drops...