I don't really need work shows because I know how to work it just keeps saying its wrong. Thank you, Pictures linked below

The supply function for soda is: QS = -4 + 2PS The demand function for soda is: QP = 20 - 2PD In the absences of taxes or subsidies, the consumer surplus at the market equilibrium is: Answer:The supply function for soda is: QS = -4+2PS The demand function for soda is: Q" = 20 - 2PD In the absences of taxes or subsidies, the market equilibrium price is