Question

The graph of an identity function on $R$ is

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Let $R$ be the set of real numbers. Define the real valued function $f:R\to R$ by $y=f(x)=x$ for each $x\in R$. Such a function is called the identity function. Here, the domain and range of $f$ are $R$. The graph is a straight line as shown in figure given below. It passes through the origin.