Answer: 4 units.
Explanation:
Once each point is plotted, you get the rectangle attached.
You can observe in the figure that the base of the rectangle is its longer side.
Since the length of the base of the rectangle goes from
to
, you can say that the lenght of the base is the difference between 3 and -1.
So, you need to subtract this two coordinates, getting that the lenght of the base of the rectangle attached is:
![lenght_((base))=3-(-1)\\\\lenght_((base))=3+1\\\\lenght_((base))=4\ units](https://img.qammunity.org/2020/formulas/mathematics/college/mr1ovxcg7teidktw0kwbp6i6r4523eelbu.png)