# How do you find the domain and range for y=x?

Because there are no restrictions on the value of $x$, the input for this function, the Domain of this function is the set of all Real Numbers: $\left\{\mathbb{R}\right\}$
This is a straight linear transformation, therefore the Range of output of this function is also the set of all Real Numbers: $\left\{\mathbb{R}\right\}$