Answer:
Given the graph, we can determine the slope, and use slope formula* to prove it.
Points: (-4, 1) and (-2, -1)
From the graph, the slope of the line is -1, mean the line goes down 1 unit and left 1 unit.
To prove this you can use slope formula*:
![m = (-1 - 1)/(-2 + 4) = (-2)/(2) = -1](https://img.qammunity.org/2021/formulas/mathematics/high-school/1kzzei7gb8k8iv6zsp1xq7ak2pvgk8t7za.png)
*Slope formula:
![m = (y_2 - y_1)/(x_2 - x_1)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/gjvq8ugonz7wbfcjxpwzkf808xsbjwfyvh.png)