Consider the following experimental VLE data for a mixture Diethyl ether (1) and Ethanol (2) at A K. (It is possible that the linear regression is not a great fit, disregard)

P(kPa) x1 y1

45.64 0.05 0.22

68.02 0.35 0.61

75.27 0.51 0.68

79.42 0.64 0.78

Build a model for activity coefficients using the Van Laar approach.