Question

How to answer the paper.

Answer 1

we can simply pick any two points off the x,y table, so

$\bf \begin{array}{|cc|ll} \cline{1-2} x&y\\ \cline{1-2} 0&20\\ 3&11\\ 6&2\\ 9&-7\\ \cline{1-2} \end{array} \begin{array}{llll} \\[1em] \leftarrow \textit{let's use this point}\\\\ \leftarrow \textit{and this point} \end{array}~\hspace{5em} (\stackrel{x_1}{3}~,~\stackrel{y_1}{11})\qquad (\stackrel{x_2}{9}~,~\stackrel{y_2}{-7}) \\\\\\ slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{-7-11}{9-3}\implies \cfrac{-18}{6}\implies -3$