Answer:
Regents of the University of California v. Bakke
Step-by-step explanation:
The court case that quota system was used as an affirmative action plan ruled unconstitutional is the "Regents of the University of California v. Bakke" case.
The case in the year 1977 was all about a Plaintiff that goes by name Alan Bakke accusing the University Of California Davis medical school that he was not giving admission because of his race. The case was in favour of the plaintiff, Alan Bakke and the quota system used as an affirmative action plan ruled unconstitutional.