When two pointson a coordinate grid are connected, they form a line
or line segment which has a slope. The slope of a line is the measure of its
steepness. Think of slope as the effort to climb a hill. A horizontal surface
is zero effort, so horizontal lines have a slope of 0. Steep hills take a lot of
effort to climb, so steep lines have greater slopes than gradually tilted lines.
Finally, a vertical surface cannot be climbed (without equipment), so verti-
cal lines have an undefined slope (no slope).slope of 0steep slopegradual slopeundefined
slopeyx20
The Slope of a Line