Answer
$b = -1$
Work Step by Step
$b$ is the $y$ intercept of the function, and we can see clearly that it intersects the $y$ axis at $y = -1$.
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.