Now, be clear. The true relationship between x and y is not linear. It looks like some type of an exponential relationship. But the value of transforming the data, and there's different ways you can do it. In this case, the value of taking the log of y and thinking about it that way is now we can use our tools of linear regression. Because this data set, you could actually fit a linear regression line to this quite well. You could imagine a line that looks something like this.