Solve clearly

Suppose that total utility G(x) + H(y) is the twin-power with general coefficients. Please fill In the blanks. ay = 2 a =2 b = 0.5 MRSxy at x/y=1/4 MRSxy at x/y=1/2 MRSxy at x/y=1 MRSxy at x/y=2 MRSxy at x/y=4 ratio elasticity of MRS