Mathematics is the science of numbers as Aristotle defined. Here we have collected all the important mathematics definitions. Browse these definitions or use the Search function for a specific definition.

Math Definitions

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There are currently 3 definitions in this directory beginning with the letter X.
X
The letter "x" is often used in algebra to mean a value that is not yet known.

It is called a "variable" or sometimes an "unknown".

In x + 2 = 7, x is a variable, but we can work out its value if we try!

A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
X Axis
The line on a graph that runs horizontally (left-right) through zero.

It is used as a reference line so you can measure from it.
X Coordinate
The horizontal value in a pair of coordinates: how far along the point is.

The X Coordinate is always written first in an ordered pair of coordinates (x,y), such as (12,5).

In this example, the value "12" is the X Coordinate.

Also called "Abscissa"

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