Answer:
Step-by-step explanation:
The formula of a slope:
[tex]m=\dfrac{y_2-y_1}{x_2-x_1}[/tex]
We have the points (4, -1) and (-1, 4). Substitute:
[tex]m=\dfrac{-1-4}{4-(-1)}=\dfrac{-5}{5}=-1[/tex]