Expressions using variables — lesson. Mathematics CBSE, Class 6.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Variable:

A variable is a symbol that is undefined yet. A variable is something that keeps varying.

If '

$x$ ' is a variable,

$x$ can hold the value of any number.

Example:

If '

$x$ ' denotes the age of a person, then

$x$ can hold any value from

$1, 2, 3...$ as age cannot be a negative number.

Co-efficient:

A co-efficient is a number used to multiply a variable.

The number multiplied read as being a co-efficient of a variable.

Example:

$5p$ ,

$5$ is the coefficient of '

$p$ '.

Constant:

A constant is any whole number such as

$0, 1, 2, 3,...$

Expression:

We would have come across many expressions in mathematics such as

$3 + 2$ ,

$6 - 4$ and so on.

In algebra, such expressions are written using symbols.

An expression is a combination of variables and constants.

An algebraic expression can be both a combination of variables and constants or wholly variables.

Example:

$2x$

$+$

$3$ ,

$3x$

$+$

$4y$ and so on.

Let us look at a few more expressions:

1. Consider

$4x + 10$ :

$4$ is the co-efficient of '

$x$ '.

$x$ is the variable.

$10$ is the constant.

$4x + 10$ is altogether an expression.

2. Consider

$7x + 2y$ .

$7$ is the co-efficient of '

$x$ '.

$2$ is the co-efficient of '

$y$ '.

$x$ ' and '

$y$ ' are variable

$1$ and variable

$2$ respectively.

$7x + 2y$ is altogether an expression.

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1. Expressions using variables

Theory: