Variable Definition:

In rudimentary arithmetic, a variable is an alphabetic character speaking to a number, called the estimation of the variable, which is either discretionary or not completely indicated or obscure.

Making arithmetical calculations with variables as though they were express numbers permits one to take care of a scope of issues in a solitary calculation. An ordinary illustration is a quadratic recipe, which allows one to explain each quadratic condition by just substituting the numeric estimations of the coefficients of the offered condition to the variables that speak to them.


The idea of a variable is likewise major in math. Regularly, a capacity y = f(x) includes two variables, y and x, speaking to individually the quality and the contention of the capacity. The expression “variable” originates from the way that, when the contention (additionally called the “variable of the capacity”) shifts, then the quality changes accordingly.

In more propelled science,a variable is an image that signifies a scientific article, which could be a number, a vector, a framework, or even a capacity. For this situation, the first property of “variability” of a variable is not kept.

Types of variables:

Dependent Variables – Dependent variable is characterized as the variable whose quality depends on the estimation of another variable in its condition. That is, the estimation of word variable is dependably said to be reliant on the free variable of math condition.

For instance, consider the condition y = 4x + 3. In this condition, the estimation of the variable ‘y’ changes as per the adjustments in the estimation of ‘x’. In this manner, the variable ‘y’ is said to be a reliant variable. A portion of the cases that include subordinate variables is talked about in point of interest as beneath with their answers.

Independent Variables – In an algebraic equation, independent variable describes a variable whose values are independent of changes. If x and y are two variable in an algebraic equation and every value of x is linked with any other value of y, then ‘y’ value is said to be a function of x value known as an independent variable, and ‘y’ value is known as a dependent variable.

Example: In the expression y = x2, x is an independent variable and y is a dependent variable.

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Practise This Question

Coefficient of term xy2 in expression  x3x5+xy2