Question

when an equation is called an identity?

Answer 1

it is used in algebra and in order to solve the equation of give variable

Answer 2

Hey there,
An identity is an equation that is true for all values of the variables. For example:(x + y)² = x² + 2xy + y²
The above equation is true for all possible values of x and y, so it is called an identity.

Hope this helps!