On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)_{s} and the slope of the reversible isothermal line (∂P/ ∂V)_{T} are related as (where, y = C_{p}/C_{v})