[tex]\begin{gathered} L\text{ine A} \\ P1(6,6) \\ P2(6,4) \\ \text{slope}=\frac{y2-y1}{x2-x1} \\ \text{slope}=\frac{4-6}{6-6} \\ \text{slope}=\frac{4-6}{0} \\ \text{slope}=\text{ }DNE \\ \\ Line\text{ B} \\ P1(-5,-3) \\ P2(3,-3) \\ \text{slope}=\frac{y2-y1}{x2-x1} \\ slope=\frac{-3-(-3)}{3-(-5)} \\ slope=\frac{-3+3}{3+5} \\ \text{slope =}\frac{0}{8} \\ \text{slope =0} \\ \\ Line\text{ C} \\ P1(-2,3) \\ P2(0,-2) \\ \text{slope}=\frac{y2-y1}{x2-x1} \\ \text{slope}=\frac{-2-3}{0-(-2)} \\ \text{slope}=\frac{-5}{2}=-2.5 \\ \end{gathered}[/tex]
