What is the x-coordinate ? Definition and examples.

The x-coordinate of a point, also called abscissa, is the first number in an ordered pair. It indicates a distance along the x-axis or horizontal axis in the coordinate system.


For the point (3, 4), the x-coordinate is 3. This means that the distance along the horizontal axis is 3.

For the point (-5, 1), the x-coordinate is -5.  The distance along the horizontal axis is 5 and it is still a positive number. However, notice that this time, the point is in the second quadrant.

The x-coordinate can either be positive or negative. The x-coordinate is positive in the first and fourth quadrant and negative in the second and third quadrant.

The x-coordinate is called x-value when dealing with functions.

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