Chapter 1.3, Problem 9E

To determine

To show: The slope $m=\frac{n\left({\displaystyle \sum xy}\right)-\left({\displaystyle \sum x}\right)\left({\displaystyle \sum y}\right)}{n\left({\displaystyle \sum x^2}\right)-{\left({\displaystyle \sum x}\right)}^2}$ and $b=\frac{{\displaystyle \sum y}-m\left({\displaystyle \sum x}\right)}{n}$ by solving the system of equations for b and m.