Question

# An example for a function which is a relation, (Domain-R, Codomain-R) is:This question has multiple correct optionsA. $y = x$ B. $y = x - 1$ C. $y = {x^2}$ D. None of these

Every function is a relation when each input has only one output. It means that for a particular value of $x$, there should be only one value of $y$ corresponding to that value of $x$.
Hence, all the three given functions i.e., $y = x$, $y = x - 1$ and $y = {x^2}$are examples of relations.
Note- For function $y = {x^2}$, at $x = 1$ and $x = - 1$ the value of the function is the same which is $y = 1$. Here, corresponding to two inputs there is one same value of output which is possible for a relation because corresponding to each value of input there is only one output.