State the range of the function and sketch the graph of \(y=f(x)\). Define the inverse relation in similar form and determine whether this inverse relation is a function.

A *relation* is a set of pairs of values, where the order matters, for example, {(1,4), (2,8), (3,12)}.

You can see that this relation could be associated with the function \(f(x) = 4x\).

Can you give an example of a relation which cannot be associated with a function like this?

What is the property of a relation that makes it a function? Can you tell if the inverse you found for this question has this property?