Give an example of function

Question

A function f is called increasing, if f(x1) ≤ f(x2) whenever x1 < x2.

A function f is called decreasing, if f(x1) ≥ f(x2) whenever x1 < x2.

(a) Give an example of an increasing function.

(b) Give an example of a decreasing function.

Answer 1

f(x)=x

f(x)=-x