Answer
Domain is all real numbers.
Work Step by Step
Since this is a linear line and it goes on forever, there are no restrictions on the domain, since you can plug in any x-value and get a y-value back.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.