1. Open command prompt and run 'virtualenv -p python3.9 env-name', make sure you are in backend folder and you have virtualenv installed( you can install by using 'pip install virtualenv').

2. Now, in command prompt run 'env-name\scripts\activate' so that your virtual environment begins.

3. Now to install the matching dependencies run 'pip install -r requirements.txt'.

4. After all the dependencies are installed run 'flask run' to start the backend server, follow the link to view it on the browser.