Hello, how can I solve this question? I'm unclear of how to show the steps

3.-The supply function in the market for certain good A is given by 2 p 507.4) = 3', where 11,; is the price of that good. The demand function is given by new 103) = 20 - 2m - 13%. Where p3 represents the price of some other good, B. a) Are goods A and B substitutes or complements? Why? b) Obtain the equilibrium price of good A when the price of good B is p3 = 2. c) Compute the price elasticities of demand and supply for good A in equilibrium