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 Related Terms
 Tangent Line:  A line that intersects a graph in exactly one point; all other points of the graph lie entirely on one side of the line.
Tangent: When two figures are tangent, they share only one common point.
Intersecting Lines: Two lines that cross each other. Lines intersect at one point unless the lines fall directly on top of each other (in which case they are essentially the same line and are sometimes called coincidental).
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Graph of a Function: The set of all the points on a coordinate plane whose coordinates makes the rule of function true.
Point: One of the basic undefined terms of geometry. A point has no length, width, or thickness, and we often use a dot to represent it.