Question

Define an identity function and draw its graph also find its domain and range.

Answer 1

The function $f:M\to R;f\left(x\right)=x$ for all $\parallel x\in R$ is called an identity function on $R$.

$x$	$-2$	$-1$	$0$	$1$	$2$
$f\left(x\right)$	$-2$	$-1$	$0$	$1$	$2$

Domain of $f=R$
Range of $f=R$