# Linear Regression

${\displaystyle Sales=\beta _{Constant}+\beta _{Advertising}\times Advertising+\beta _{price}\times Price}$
where ${\displaystyle \beta _{Constant}}$, ${\displaystyle \beta _{Advertising}}$ and ${\displaystyle \beta _{Price}}$ are parameters to be estimated from the data (in the context of regression, the parameters are commonly known as coefficients and these parameters represent the underlying base rate of sales and the relative effects of advertising and price, respectively).