[tex]\begin{gathered} \text{slope}=\frac{y_2-y_1}{x_2-x_1} \\ (-13,61)(-6,40) \\ \text{slope=}\frac{40-61}{-6-(-13)} \\ \text{slope}=\frac{-21}{7} \\ \text{slope}=-3 \end{gathered}[/tex][tex]\begin{gathered} y-y_1=m\mleft(x-x_1\mright) \\ (-13,61) \\ y-61=m(x-(-13)) \\ y-61=m(x+13) \\ y-61=-3(x+13) \\ y-61=-3x-39 \\ y=-3x-39+61 \\ y=22-3x \end{gathered}[/tex][tex]\begin{gathered} y-y_1=m(x-x_1) \\ (-6,40) \\ y-40=-3(x-(-6)) \\ y-40=-3(x+6) \\ y-40=-3x-18 \\ y=-3x-18+40 \\ y=-3x+22 \\ y=22-3x \end{gathered}[/tex]
