Step-by-step explanation:
[tex]{\boxed{\sf Slope_{(m)}=\dfrac{y _2-y_1}{x_2-x_1}}}[/tex]
[tex]\qquad {:}\longrightarrow\mathbb m=\dfrac {-3-5}{-3+6}[/tex]
[tex]\qquad {:}\longrightarrow\mathbb m=\dfrac {-8}{3}[/tex]
[tex]\therefore\sf Slope=\dfrac {-8}{3}[/tex]