The sign for infinity is ∞
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line: it goes on for infinity. <---------> line segment: has 2 endpoints, does not continue. -------- ray: starts at one point, then goes on for infinity. --------->
A vertical line has a slope of infinity.
This is the graph of a diagnol line. Range: (-infinity, infinity)
A line is a one-dimensional set of points that extends to infinity in both directions (so it has no endpoint). A ray is a line that goes to infinity in only one direction and has one endpoint. A line segment is a line with two endpoints (so it does not go to infinity).
Straight lines. They are all infinitely long.