00:01
The demand for airline travel is quite sensitive to price.
00:04
Typically, there's an inverse relationship between demand and price.
00:08
When price decreases, demand increases, and vice versa.
00:12
One major airline found that when the price for a round -trip ticket between chicago and l .a.
00:17
Is $600, then the demand is $500.
00:22
Then, when the price is reduced to $400, the demand jumps to $1 ,200.
00:28
So we want to plot and get a model that will do.
00:31
Determine the total revenue.
00:34
So if i look at this and plot these, then i'm going to have 600, 500 would be here, 400, 1200 would be here, and we're looking at a linear function.
00:44
So let's go get y equals mx plus b as our function.
00:48
So i'm going to get my slope first by doing some subtraction.
00:52
So it's going to be 700, and that's going to be negative 200.
00:56
So i'm going to put 700 over negative 200, and my zeros will cancel out.
01:02
I have y equals negative 7 over 2x plus b.
01:06
Let's find our intercept.
01:08
I'm going to put 600, i mean 500 for y, equals negative 7 halves times 600 plus b.
01:16
So let's see what that's going to be.
01:18
That's going to be 300...