Final answer:
The slope of a line describes how much the line moves up or down on the y-axis for every one-unit increase in the x-axis.
Step-by-step explanation:
The slope of a line, represented by the letter m in the equation, describes how much the line moves up or down on the y-axis for every one-unit increase in the x-axis. It is calculated by dividing the change in y-values (also called the rise) by the change in x-values (also called the run) between two points on the line.
For example, suppose we have a line that represents the relationship between the number of hours studied for a test and the test score. If the slope of the line is 3, it means that for every additional hour of studying, the test score increases by an average of 3 points.