Answer
f is one to one
Work Step by Step
Use the horizontal line test. Wherever you draw the horizontal line, the line only passes through one point. It passes the test, therefore f is one to one
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.