Equations — lesson. Mathematics State Board, Class 8.

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What is an equation?

A pair of expressions separated by an equal to sign is called as equation. This equal to sign indicates that the pair of expressions are equal.

Example:

$5x = 20$ is an equation. Here,

$x$ is a variable, the expression

$5x$ forms the left hand side of the equation (LHS), and the expression

$20$ forms the right hand side of the equation (RHS).

Now, let us discuss about linear equation in one and two variables.

1.Linear equation in one variable:

Linear equation is an equation in which only one variable is involved and having the highest power as

$1$ . It is also known as simple equation.

Example:

$5$ times

$x$ equals

$20$ .

Solution:

The algebraic expression is given by:

$5x = 20$

This equation has only one variable and having the highest power as

$1$ . This equation is a linear equation in one variable.

2. Linear equation in two variables:

Linear equation in which two variables are involved and having the highest power as

$1$ .

Example:

$5x + 6y = 8$ ,

$3x = 12 z$

Did you find an error?

2. Equations