Hoi Tressa,
Thank you for your comment

And the answer is not that difficult. They both are a way of asking
how someone is. if you translate them to English:
#Hoe gaat het met jou? - How is it with you?
# Hoe gaat het ermee? - How is it with? ( doesn't really make in sense though)
Both are polite forms and can be used in any kind of situation.
Succes Tressa!
Jacob,
Team DutchPod101.com