A slant of a line on a graph is called what?

The slant of a line on a graph is called the "slope." The slope measures the steepness and direction of the line, indicating how much the y-value changes for a given change in the x-value. A positive slope indicates the line rises from left to right, while a negative slope indicates it falls. A slope of zero represents a horizontal line, and an undefined slope corresponds to a vertical line.