What describes a positive slope on a line?

A positive slope on a line indicates that as you move from left to right, the y-values increase. This means that for every step you take along the x-axis in the positive direction (to the right), the corresponding value of y rises. This creates an upward trend in the graph. Specifically, the line moves upwards as it extends to the right, illustrating that the relationship between the x and y variables is positively correlated.

In contrast, a horizontal line has a slope of zero, indicating that y does not change regardless of x, which does not reflect a positive slope. A line that descends when moving right to left represents a negative slope, wherein y decreases as x increases. A vertical line, on the other hand, is undefined in terms of slope as it does not move horizontally at all. Hence, the description of a line moving left to right and rising upward perfectly captures the essence of a positive slope.