You use the slope formula:
![m = (y_(2)-y_(1))/(x_(2)-x_(1))](https://img.qammunity.org/2019/formulas/mathematics/high-school/9juhm50fybf4gj60k3u330e32ecix2quaw.png)
And you plug in the points. The first point is (-4,4), and the second point is (0,-1)
y₂ is the second y value/coordinate (which is -1)
y₁ is the first y value/coordinate (which is 4)
x₂ is the second x value/coordinate (which is 0)
x₁ is the first x value/coordinate (which is -4)
![m = (y_(2)-y_(1))/(x_(2)-x_(1))](https://img.qammunity.org/2019/formulas/mathematics/high-school/9juhm50fybf4gj60k3u330e32ecix2quaw.png)
![m = (-1 - 4)/(0 - (-4))](https://img.qammunity.org/2019/formulas/mathematics/high-school/g5s3mb10lmpdwpbkvzw5eeo9zor58i4jcx.png)
![m = (-1 - 4)/(0 + 4)](https://img.qammunity.org/2019/formulas/mathematics/high-school/ctd6c2nugt6wl51t5tq0yx6s638gw17map.png)
![m = (-5)/(4)](https://img.qammunity.org/2019/formulas/mathematics/high-school/tygdcnh7lc3ck7kma2jmmz7mh8m0g74kar.png)
That is your slope