Solve via Cramer \begincases 2x + 3y = 7 }, {x - y = 1 \endcases . (Ans: x = 2, y = 1 .)Solve via Cramer \begincases 2x + 3y = 7 }, {x - y = 1 \endcases . (Ans: x = 2, y = 1 .)

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