The concentrations change to maintain the original value of K.
Explanation:
The concentration changes to maintain the original value of K when the concentration of the system changes.
This is the effect concentration has on a reaction at equilibrium.
Le Chatelier's principle proposes that "if any conditions of a system in equilibrium is changed, the system will adjust itself in order to annul the effect of the change".
The equilibrium constant K is temperature dependent.
An increase in concentration of a specie favors the direction that uses it up and vice versa.
This does not change the value of the equilibrium constant.