Solve by Cramer: \begincases x + y = 5 }, {2x - y = 1 \endcases . (Ans: x = 2, y = 3 .)Solve by Cramer: \begincases x + y = 5 }, {2x - y = 1 \endcases . (Ans: x = 2, y = 3 .)

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