How do you state domain and range?

Domain is the set of all possible numbers for a function on the X axis on a graph, and range is the set of all possible numbers for a function along the Y axis on a grpah. (The X axis is the one that runs horizontally, while the Y axis runs vertically). The domain and range define from and up to which numbers a function's point (coordinate) may be located on a graph. To state the domain of a function, you must find out what values "x" may and may not be in the function (equation), and the same goes for range. A good way to check if you've got your domain and range right is to try plugging in the numbers that you have found to be "restricted" and see if they really do produce an impossible or inaccurate result, or doesn't give you a result at all!