Let Fbe a function of two variables, defined by F(K, L) = 9 In K+ 4 In L. %3D (a) Find RK = F,'(K, L}/F2'(K, L), the marginal rate of substitution of L for K. %3D (b) Find aLK = ElR,(LIK), the elasticity of substitution between L and K along a level curve for F. %3D RLK=(Simplify your answer.) %3D OLK =

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