Work Step by Step
We are given the equation $-8=-9+r$. In order to solve, we must add 9 to both sides. $-8+9=-9+r+9$ Therefore, $r=1$.
You can help us out by revising, improving and updating this answer.Update this answer
After 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.