Thermodynamics Problem

I'm working on a chemical engineering question and need guidance to help me study.

A binary system of water (1) – benzene (2) exists in vapor-liquid equilibrium at 3 bar. At this pressure, the vapor phase can be assumed an ideal gas. If the activity coefficients in the liquid phase can be described by the two suffix Margules equation with .

Show using a clear a clear algorithm (with all relevant assumptions/equations shown) how would you construct a T vs. x1,y1, phase diagram.

Show whether the system is specified, over specified or under specified

Demonstrate your above algorithm by calculating equilibrium values for x1,y1, in the middle of the temperature range.