The slope is given by:
[tex]\begin{gathered} m=\frac{rise}{run}=\frac{y2-y1}{x2-x1} \\ \text{let:} \\ (x1,y1)=(0,-4) \\ (x2,y2)=(5,0) \end{gathered}[/tex][tex]\begin{gathered} \text{rise}=0-(-4)=4 \\ \text{run}=5-0=5 \\ \text{slope}=m=\frac{4}{5}=0.8 \end{gathered}[/tex]