Why is my new cat not eating and refusing to use the litter box?

There could be several reasons why your new cat is not eating and refusing to use the litter box. It is common for cats to experience stress when adjusting to a new environment, which can affect their eating and litter box habits. Other possible reasons could include health issues, dietary preferences, or the need for a different type of litter. It is important to monitor your cat's behavior and consult with a veterinarian for further evaluation and advice.