Use the elimination method to find all solutions of the system \begin{cases} x^2 - y^2 + 3 = 0 \\ 2x^2 + y^2 - 4 = 0 \end{cases} The four solutions of the system are: Enter your answer as a list of ordered pair. For example: (2, -5), (5, -2), (1, 3), (3, 1)