[tex]\begin{gathered} \Rightarrow m=\frac{y_2-y_1}{x_2-x_1} \\ \Rightarrow m=\frac{17-20}{-2-12} \\ m=\frac{-3}{-14}=\frac{3}{14} \\ \text{Now, the equation in point-slopeform is,} \\ \Rightarrow(y-y_1)=m(x-x_1) \\ \Rightarrow(y-20)=\frac{3}{14}(x-12) \end{gathered}[/tex]
