What shows the change in Y for every change in X?

The change in Y for every change in X is represented by the slope of a line in a linear equation, typically written as Y = mx + b, where m is the slope. In statistical terms, this relationship is often described using regression analysis, where the slope indicates the rate of change in the dependent variable (Y) for a one-unit change in the independent variable (X). Thus, the slope quantitatively shows how much Y changes with respect to changes in X.