00:01
Okay, so what we're going to do here is we're going to find a linear formula for cost, given these two points.
00:07
It's really just data points, so points.
00:09
So what we're going to do is find a slope between them and use one of the points and construct an equation, you know, like we normally would with y equals mx plus b.
00:15
Okay, so the slope, which i'll call m is going to be, well, if you remember the formula, it's y2 minus y1, divided by x2 minus x1.
00:26
Okay, that's 300 minus 100, divided by 800 minus 500.
00:31
That's 200 over 300, which is two thirds.
00:35
That's the slope.
00:37
Now using the formula, in this case not y, but c equals mx plus b.
00:44
We're going to find the formula.
00:45
So that would be c equals two thirds.
00:48
In this case, we do know it's, let's go ahead and use maybe the first point here...