Let's begin by listing out the information given to us:
[tex]\begin{gathered} (x_1,y_1)=(1,3) \\ (x_2,y_2)=(3,2) \end{gathered}[/tex]The slope is calculated using the formula:
[tex]slope(m)=\frac{y_2-y_1}{x_2-x_1}[/tex]We will proceed by substituting the values into the equation, we have:
[tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1}=\frac{2-3}{3-1}=-\frac{1}{2} \\ \therefore m=-\frac{1}{2} \end{gathered}[/tex]