Although [Vitor Fróis] is explaining linear regression because it relates to ... y=mx+b. Here, m is the slope of the line and b is the y-intercept. Another way to think about it is that m is ...

The purpose of this tutorial is to continue our exploration of regression by constructing linear models with two or more explanatory ... have a model in which all the explanatory variables are ...

Here is that spreadsheet with the same data AND with the SLOPE() and INTERCEPT() function in google docs to show the answer is the same. There. That is the the basic form of linear regression by hand.