1. The problem statement, all variables and given/known data P = -50Qd + 80 P = 2Qs + 10 P = Price Qd = Quantity demanded Qs = Quantity supplied Find the equilibrium Price and Quantity. 2. Relevant equations Qd = Qs (equilibrium) 3. The attempt at a solution Qd = Qs Q Since they both equal to P -50Q + 80 = 2Q + 10 [-2Q] -52Q + 80 = 10 [-80] -52Q = -70 [/52Q] Q = 70/52 Equilibrium Quantity = 70/52 I don't know why this is wrong?