An important property of every line is its sleepness or?

An important property of every line is its slope, which measures the steepness or incline of the line relative to the horizontal axis. The slope is calculated as the ratio of the vertical change (rise) to the horizontal change (run) between two points on the line. A positive slope indicates an upward incline, while a negative slope indicates a downward incline. The slope is fundamental in understanding the line's direction and behavior in a coordinate system.