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To calculate the equilibrium constant, you use the ratio of the equilibrium concentrations of the products over the reactants. At equilibrium, the concentrations of A,B, and C should not change. We see that at the end of the graph. A was the reactant, while B and C were the products. The equilibrium constant is expressed as [P]/[R], so it should be A/BxC. Now just plug in the values given from the graph and you have the equilibrium constant.
You don't need to know the volume because you will use the partial pressures given to you in the graph for your calculation of the equilibrium constant. The equilibrium constant is calculated by dividing the partial pressure of the products over the partial pressure of the reactant: K= (Pb)(Pc)^2 / (Pa)^2. You find the partial pressure at equilibrium by subtracting the final point on the line of the graph from the initial starting point on the line of the graph for each product and reactant.
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