Suppose that the monthly demand function of a particular commodity is given by P= 200 -0.4x and the supply function is P = 0.2x + 80 where x is the number of units demanded and supplied and P is in pesos.
a) Determine the equilibrium prics and quantity
b) At a unit prices of P 140, by how many unit does supply exceed demand.
c) At a unit prices of P 90, by how many unit does demand exceed supply.
d) Graph the demand and supply equations in the same coordinate plane.