4a.) Let QDx = 20 - 2*PX and QSx = 10 + 3*PX. What is the mathematical relation between QDx and QSx at equilibrium? Given that, calculate equilibrium price and quantity.

b.) Calculate QDx and QSx for a price greater than equilibrium. Is this a shortage or a surplus? Of how many units?

c.) Let supply "shift" to QSx' = 5 + 3*PX. Calculate equilibrium price & quantity. What exactly would have happened if price had remained the same as your answer to pt. a?

d.) Draw all of this on one graph (carefully)