Hello!
So, I can already tell seeing as the line is going down from left to right that it will have a negative slope.
I have located two points on this graph:
-2, 2
0, -2
So, we'll use these to find the slope. The slope formula is y2-y1/x2-x1
Plug in these values in to the equation:
2-(-2)/-2-(0)
2/-2
Slope = -1