Question

Define horizontal lines.

Answer 1

Horizontal line (Coordinate Geometry)

 

Definition: A straight line on the coordinate plane where all points on the line have the same y-coordinate.

Try this Drag the points A or B and note the line is horizontal when they both have the same y-coordinate.

A horizontal line is one the goes left-to-right, parallelto the x-axis of the coordinate plane. All points on the line will have the same y-coordinate. In the figure above, drag either point and note that the line is horizontal when they both have the same y-coordinate.

Answer 2

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A horizontal line is one which runs left-to-right across the page. In geometry, a horizontal line is one which runs from left to right across the page. It comes from the word 'horizon', in the sense that horizontal lines are parallel to the horizon.