Respuesta :

TSO
[tex]Slope~formula = \frac{y_2-y_1}{x_2-x_1} = \frac{-1 \frac{1}{2}- \frac{1}{2} }{2 \frac{1}{2}-\left ( -\frac{1}{2} \right) } = \frac{-2}{2 \frac{1}{2} + \frac{1}{2} } = \frac{-2}{3} =\boxed {- \frac{2}{3} }[/tex]