[tex]\bf \begin{array}{|cc|ll} \cline{1-2} \stackrel{hours}{x}&\stackrel{\$}{y}\\ \cline{1-2} 40&880\\ 50&1210\\ \cline{1-2} \end{array}~\hspace{7em} (\stackrel{x_1}{40}~,~\stackrel{y_1}{880})\qquad (\stackrel{x_2}{50}~,~\stackrel{y_2}{1210}) \\\\\\ slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{1210-880}{50-40}\implies \cfrac{330}{10}\implies 33[/tex]
[tex]\bf \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-880=33(x-40) \\\\\\ y-880=33x-1320\implies y=33x+2200[/tex]
