In brown versus the Board of Education the Supreme Court overturned the prettiest woman in Plessy v ferguson that separate but equal was constitutional so long as equal accommondations were provided what constitutial amendment was interpreted in both of these cases

Yes, this is true. In brown vs board of education of Topeka, the case got a legal victory due to the fact that it wasn't separate but equal, as the girl had to walk 20 blocks - a few miles - to get to her school, as she attends a black school. white people were able to get to schools near them, which is totally unfair. so the supreme court said 'separate but equal' is unconstitutional.