Suppose the equilibrium constant of the reaction CO + 1/2O2 CO2 at 1500 K and 1

Question:

Suppose the equilibrium constant of the reaction CO + 1/2O2 ↔ CO2 at 1500 K and 1 atm is K1. Express the equilibrium constant of the following reactions at 1500 K in terms of K1.
(a) CO + (1/2)O2 ↔ CO2 at 2 atm,
(b) CO2 ↔ CO + (1/2)O2 at 1 atm,
(c) CO + O2 ↔ CO2 + (1/2)O2 at 1 atm,
(d) CO + 2O2 + 6N2 ↔ CO2 + 1.5O2 + 6N2 at 5 atm and
(e) 2CO + O2 ↔ 2CO2.