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Those are letters commonly used for variables. As such, they can stand for any number. A variable may refer to "any number", as in:For any number, call it "x", 2x = x + x

Or for a specific number, which has yet to be found, as in: find the value of "x", such that 2x + 1 = 7 (the solution is 3, in this example).

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8y ago
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8y ago

As well as what Hilmar said, if you are thinking of Geometry, these letters are often used to name the three axes in 3D Geometry: X, Y and Z axis.

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Q: What do x y and z mean in math?
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If you mean what is the name for what x, y, and z when used in math, then the word is variable.


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A binary operator, ~, defined over the elements of a set S, has the associative property if for any three elements x, y and z of S, (x ~ y) ~ z = x ~ (y ~ z) and so we can write either of them as x ~ y ~ z without ambiguity.


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A mathematical property, ~, is said to be transitive over a set S if, for any three elements, x y and z x ~ y and y ~ z implies than x ~ z. For example, "is greater than (>)" is transitive, but "is not equal to" is not.


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Why all graph lies in x and y plane but not in z-plane?

The z-direction is used in upper level mathematics when the additional variable, z, is added for analysis. When this is done, equations are usually functions of x and y, with z being the dependent variable. Functions in the x-y plane are a special subset of the functions with x, y, and z, where z = 0.Algebra, Calculus and other lower math courses typically only deal with the two variables, x and y, because, as many people will attest, it is hard enough just with two variables. Therefore it is enough for all the graphs to be contained in the x-y plane and to ignore the z-direction in order for students to learn basic concepts and ideas to be used in later math courses which may add the z variable (and potentially more variables in the more abstract math courses).