Variable

Initial Definition

A variable is a symbol used to represent:

- a number in an expression
- an unknown value in an equation
- a number or element of a set in a relation connecting two or more sets

Examples

- Expression: 2n + 3 [the variable is n]
- Equation: x + 3 = 5 [the variable is x]
- Relation: y = x + 3 [the variables are x and y]

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