To find the slope you have to use this formula:
![(y2-y1)/(x2-x1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/bfzf3yhi4vb32rywgz5x1tf3eazz6f61eq.png)
First chose any 2 random points from the graph, im gonna chose (0,1) and (-4,4). It doesn't matter which one is the x1 or x2, what matter is they have to be in the same order, you can't have (-4,4) as a (x1,y2), That's wrong.
![((1)-(4))/(4-0)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/m717o0p4712a89brg5vnfdf9hb4ymjsmk5.png)
= -3/4