00:01
So a local retailers determine the number of games sold in a week is related to its price, or determines the price.
00:08
So we have 40 games systems sold when the price was 120.
00:12
So we're going to have 120 would be my price and my games would be 40.
00:19
So this needs to be reversed because they're talking about the games being dependent upon the price.
00:25
So my price is going to be my independent variable.
00:28
So i'm going to put it this direction.
00:30
And now it says 100 systems were sold, so that's going to be when the price was 75.
00:42
So we had 100 here.
00:44
We want to find the linear equation.
00:47
So we're going to go y equals mx plus b.
00:50
So i'm going to find my slope.
00:52
So i'm going to say 40 minus 100, that's negative 60, 120 minus 75.
00:58
That's going to be 45.
01:00
So that's going to be my slope then.
01:02
It's going to be negative 60 over 45.
01:06
I can reduce that by dividing by 15 to get negative 4 over 3.
01:12
So i'm going to say y equals negative 4 thirds x plus b, where x is my price...