Final answer:
The values 4, 3, 2, and 1 represent the independent variable.
Step-by-step explanation:
In the given set of points (4,2), (3,1),(2,0),(1,-1), the first value in each pair represents the independent variable. The independent variable is the variable that is controlled or changed in the experiment. In this case, the independent variable is the x-coordinate of each point. So, the values 4, 3, 2, and 1 represent the independent variable.