What happens to the equilibrium constant of an endothermic reaction, that is in equilibrium, when the temperature increases? What would the effect of increasing pressure have on the reaction and on the value of Kc?

Increasing the temperature of an endothermic reaction would favour the forward reaction, thereby increasing the concentration of the products compared to reactants, which in hand increases the value of Kc, the equilibrium constant. Increasing pressure would not change the value of Kc, as it is independent of pressure, however it would shift the position of equilibrium towards the side with the least moles of gas.