What is the identity function graph? The identity function is a particular case of the affine function **f(x) = a.x + b**, where **a** = 1 and **b** = 0. The identity function is a function of f : ℝ→ℝ of the form of **f(x) = x **, where **x** is a real number and **x ≠ 0. **

## What is the identity function graph?

The graph of an identity function is a straight line that crosses the point (0 , 0). For example, in the function **f(x) = x**, the graph will be a straight line that crosses the point (0 , 0) and will have a slope of 45º.

To plot the graph, one can build a table to find the points:

Notice that the points are **identical**, and then plot the graph as below :