If B is reactant so the equilibrium will shift right side and if it is on product side the equilibrium will shift towards left side.
Equlibirium shift means increased rate of conversion of substance,predicating on the change in the reaction in the first reaction.
Three things which can cause equilibrium shifts are:
1) a change in the concentration of the components by adding or removing reactants or products.
2) a change in total pressure or volume
3) A change in the temperature of the system.
If B is from reactants side the equilibrium will shift towards right and if it is at product side it will shift towards right .
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