An undefined slope cannot be computed. Vertical lines have undefined slopes.
A line with zero slope is a line without any steepness, or a horizontal line.
The intercepts of a curve are the locations where the curve intersects the and axes. An intercept is a point at which the curve intersects the -axis. A intercept is a point at which the curve intersects the -axis.
Learn how to write the equation of a line given the slope and any point.