Look at the picture.
The slope-intercept form: y = mx + b
m - slope
b - y-intercept
[tex]m=\dfrac{\Delta y}{\Delta x}[/tex]
We have [tex]y=\dfrac{4}{5}x-1[/tex]
[tex]b=-1\to(0,\ -1)[/tex]
[tex]m=\dfrac{4}{5}\to\dfrac{\Delta y}{\Delta x}=\dfrac{4}{5}[/tex]
4 units up and 5 units right
