# How Do You Find the Indicator of a Function?

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This blog discusses the variable and indicators of a function.

In Maths indicator function can refer to either of the two – in variables or in statistics but it depends on where you read it.

Firstly, you can find in Probability and Set Theory, where it stands for a random variable for an event that equals 1 when the event happens and 0 when the event does not happen.

Secondly, it is used in Statistics to refer to a synonym for a characteristic function that defines a probability distribution completely.

In maths, the variable is a term or an alphabet that stands for an unknown number of unknown value or unknown quantity.

The variables are particularly used in algebraic expressions or in algebra. For instance, x+6=3 is a linear equation where X is a variable where 6 and 3 are constants.

The variable is a quantity that can be altered or which is not fixed according to the mathematical operation performed.

In algebra generally, we use the terms ‘x’ and ‘y’ although this is not particular and any of the alphabets can be used.

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**What are Variables?**

In Mathematics a variable is defined as the alphabetic character that expresses a numerical value or a number. In algebraic equations, a variable is used to represent an unknown quantity.

There are two types of variables – dependent and independent.

These variables can be represented by any of the 26 alphabets from ‘a’ to ‘z’. Most commonly, ‘a’, ‘b’, ‘c’, ‘x’, ‘y’ and ‘z’ are used as variables in equations.

Making arithmetical calculations with variables as though they were express numbers permits us to take care of the scope of issues in a single sum or calculation.

To give an everyday instance, take the case of a quadratic recipe. This enables you to explain each quadratic condition by simply replacing the numerical estimations of the coefficients of the offered condition with the variables that speak to them.

In maths, the idea of a variable is crucial. In a general situation, a function y = f(x) includes two variables, y, and x, articulating the quality and the contention of the function individually.

The expression ‘variable’ originates from the way that when the argument (additionally called the ‘variable of the capacity’) shifts, then the quality changes accordingly.

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**Parts of Equation**

The equations in Mathematics are composed of different parts –

**Variable**

**Constant**

**Coefficient**

**Operators**

**Term**

**For example, in the equation 3x+9=21**,

‘x’ is the variable, 3 is the coefficient of the x, 9 and 21 are constants, and ‘+’ is the operator.

The operator stands for an arithmetic symbol that is used to perform various operations on the values. The various operators are +, -, ×, ÷, and others.

The term refers to a single expression of an equation. It can be a number or a variable or a number multiplied by a variable.

**Examples of Variables**

**x+2=8**

**y+3=12**

**5x-2=10**

**4x/3=7**

In the above instances, ‘x’ and ‘y’ are called variables. This is a topic generally included in class 9 syllabus and if you are looking for online class 9, Tutopia is the best option.

**What is Constant in Maths?**

Constants in Maths refer to the values which cannot be changed or which are fixed. It is just the opposite of variables as these are terms that define themselves.

For example, in equation **9x+2=15**, ‘x’ is the variable, which can have different values and 9 is the coefficient of ‘x’ whereas the numbers 2 and 15 are the constant here.

**What is Variable in Statistics?**

In Statistics, the variables are employed in terms of real-life scenarios. It is also said to be an attribute here. These are used to represent people, places, and things.

For example, we can give the example of the colour of the hair of an individual as a variable as the hair-colour varies from person to person like black, blonde, and brown.

Types of Variables in Maths

The variables can be classified into two categories –

- Dependent variable
- Independent variable

**What are Dependent Variables?**

The dependent variable is characterized as the variable whose quality depends on the estimation of another variable in its condition. In other words, the estimation of a variable is said to rely on the free variable of the math condition.

In the example of 4x+y=3, the estimation of the variable changes as per the adjustments in the estimation of x. In this way, the variant y is said to be a reliable variable. A part of the cases that include subordinate variables is talked about in point of interest beneath their answers.

**What are Independent Variables?**

In an algebraic equation, an independent variable stands for the variable whose variables are independent of changes.

If ‘x’ and ‘y’ are two variables 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 the dependent variable.

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

Consequently, we can summarise the equation in mathematical terms as –

In mathematics, with the help of a function, we can define variables. A function is a rule for taking a number or set of numbers as input and producing an output which may also be a number or set of numbers. The most common character used to denote the input is x, and the result is y. Thus, the function is written in the form of y = f(x). Here, the character that stands for a random input is called an independent variable, i.e. x, whereas a symbol that stands for an arbitrary output is called a dependent variable; in this case, it is y.

Besides these dependent and independent variables, the other types of variables that are present are:

- Random variables
- Categorical and continuous variables
- Intervening variables
- Moderator variables
- Control variables
- Extraneous variables
- Free variables
- Bound variables

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