Summary, the system of equations of Demand-Supply model o gd 900-30*p(Demand curve gs=0-20"p( Supply curve) qd=gs Equilibrium condition◼ Summary, the system of equations of Demand-Supply model: ❑ qd = 900-30*p (Demand curve ) qs= 0 -20*p ( Supply curve ) qd = qs ( Equilibrium condition )