I need help on this I don’t really get it

Answer:
Slope = -3
Step-by-step explanation:
[tex]m=\frac{y2-y1}{x2-x1} [/tex]
So
[tex]m=\frac{2-(-1)}{(-1)-0} [/tex]
Subtract:
[tex]m=\frac{2-(-1)}{(-1)-0} =\frac{3}{-1} [/tex]
Finally, divide:
[tex]\frac{3}{-1}=-3 [/tex]
Your slope is -3 and your equation of the line is [tex]y = -3x - 1[/tex]
Hope this helped! :) Brainliest would be appreciated!