حَضَرَ مُحَمَّدٌ وَبَكْرٌ
Translation: Muḥammad and Bakr attended.
Ḥaḍara: past-tense verb; Muḥammadun: nominative subject; wāw: conjunction; Bakrun: nominative noun coordinated with the subject.
Both belong to the same subject relation, so the conjunct follows the case of the first noun.