Starting with the reaction functions of duopolists A and B, find the Cournot solution by substituting equation (1) into equation (2) and solve for QB then QA.
The reaction function of duopolist A is
QA = (12-QB)/2 (1)
The reaction function of duopolist B is
QB = (12-QA)/2 (2)
Find the Cournot solution by substituting equation (1) into equation (2) and solve for QB then QA.