Questions & Answers about У місті дев’ять машин.
Here у means in.
Ukrainian often alternates у and в to make pronunciation smoother. They are usually just two sound-based variants of the same preposition. So:
- у місті
- в місті
both mean in the city, but у місті is very natural here.
Because after у/в meaning in, Ukrainian uses the locative case.
The dictionary form is місто = city.
But in in the city, it becomes:
- місто → у місті
So місті is the locative singular form.