The identity function is a linear function.
true
false

The correct answer for this statement would be TRUE. Yes,it is true that the identity function is a linear function. A linear function is a map between two vector spaces that preserves vector addition and scalar multiplication.  
this means f(x + y) = f(x) + f(y) and f(xy) = f(x)f(y)) 
The identity function is the function such that f(x) = x 
So by using this example, we can conclude that it is a linear function.