So this student right over here spent, I don't know, it looks like they spent about.6 hours studying, and they didn't do too well on the exam. They look like they got below a 45, looks like a 43 or 44 on the exam. This student over here spent almost 4 1 1 1 studying and got, looks like a 94, close to a 95 on the exam. And what Sheera did is try to draw a line that tries to fit this data. It seems like it does a pretty good job of at least showing the trend in the data. Now, slope of 15 means that if I'm on the line, so let's say I'm here, and if I increase in the horizontal direction by one, so there I increased by the horizontal direction by one, I should be increasing in the vertical direction by 15. And you see that.