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A symbol for a value we don't know yet. It is usually a letter like x or y. Example: in x + 2 = 6, x is the variable. Why "variable" when it may have just one value? In the case of x + 2 = 6 we can solve it to find that x = 4. But in something like y = x + 2 (a linear equation) x can have many values.
In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation or an algebraic expression. In simple words, a variable is a quantity that can be changed and is not fixed. Variables are essential as they form a major algebra component. We usually use “ x ” and “ y ” to express an unknown integer.
In Maths, a variable is an alphabet or term that represents an unknown number or unknown value or unknown quantity. The variables are specially used in the case of algebraic expression or algebra. For example, x+9=4 is a linear equation where x is a variable, where 9 and 4 are constants.
In mathematics, a variable (from Latin variabilis, "changeable") is a symbol, typically a letter, that holds a place for constants, often numbers. [ 1 ][ 2 ][ 3 ][ 4 ][ 5 ] 6 One say colloqually that the variable represents or denotes the object, and that the object is the value of the variable.
Learn the basics of algebra with a free introductory course on variables and equations at Khan Academy.
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A variable is a character that has an unknown value and is represented by an alphabet or a letter. A variable can be any letter from ‘a’ to ‘ z’. However, the most commonly used letters used as variables are a, b, x, y, and z . A coefficient is a numeric value multiplied by a variable.