What mathematical concept describes a scenario where variables are linked in a way that a change in one affects the other in the same direction?

The chosen answer, directionally proportional, accurately represents the concept where a change in one variable results in a concomitant change in another variable in the same direction. Specifically, when two variables are directionally proportional, an increase in one leads to an increase in the other, and similarly, a decrease in one causes a decrease in the other. This relationship indicates a direct link between the variables, which is foundational in understanding linear relationships in mathematics and various real-world scenarios.

In contrast, inversely proportional describes a situation where an increase in one variable leads to a decrease in another variable, which is not applicable in this scenario. Uncorrelated refers to a state in which changes in one variable do not affect the other, indicating no relationship at all. Negatively correlated suggests that as one variable increases, the other decreases, again opposing the direct relationship described in this question. Therefore, directionally proportional is the most accurate term to describe the specified relationship between variables.