Is Being Angry a Sin?

The Bible teaches us to "be ye angry, and sin not." What does this mean? How do we do this? Does this contradict the idea that having anger/contempt in your heart is similar to murder? What should we do when we are angry, so we will not sin? For another visual format of this discussion, click here for pdf slides: https://drive.google.com/file/d/1Vkfm...