## Variables

### Definition of Variables

The **Variables** may be defined as the quantity that has no fixed value. The value of the **Variables** changes and can take various values over time.

### Symbol of Variables

Usually the **Variables** are denoted by the letters x, y, z, l, m, n etc.

## Constants

### Definition of Constant

A **Constant** is a quantity that has a fixed value. Any number that can be represented in the number line a constant. The value of a constant never changes over time.

### Example of Constants

1, 2, 3, -1, -2, -5, 0, 1.5, 6.5 etc.

## Difference between Constants and Variables

- The main difference between constants and variables is that the constants have a fixed value but the variables do not have any fixed values.
- The
**face value**of a constant remains the same throughout time. However, the value of variables changes over time. - The constants are represented in
**numbers**but the variables are represented by**letters**or**symbols**.

## Solved Examples on Constants and Variables

**An Algebraic Equation is given by,**2x+4=0**. Find the variables and constants.**

**Solution:** In the Algebraic Equation 2x+4=0, x is the variable and 4 is the constant. The number 2 is multiplied with x also a constant and is terms as a coefficient.

The solution of the above algebraic equation is the value of x for which the equation satisfies,

2x + 4 = 0

2x = - 4

x = \frac{{ - 4}}{2}

x = - 2

Therefore,x = - 2 is the solution of the algebraic equation.

**Find the value of**x**for the algebraic equation**x + 2 = \frac{5}{2}?

**Solution: **Given, x + 2 = \frac{5}{2}

x = \frac{5}{2} - 2

x = \frac{{5 - 4}}{2}

x = \frac{1}{2}

## Frequently Asked Questions (FAQ)

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