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Determining Whether an Ordered Triple is a Solution: (2,1,3)(-2, -1, 3)

To evaluate whether the ordered triple (2,1,3)(-2, -1, 3) is a common solution to the system of linear equations \left\{\begin{array}{l} x - y + z = 2 \ 2x - y - z = -6 \ 2x + 2y + z = -3 \end{array} ight., substitute the values x=2x = -2, y=1y = -1, and z=3z = 3 into each equation. Evaluating the first equation yields 2(1)+3=2-2 - (-1) + 3 = 2. Evaluating the second equation yields 2(2)(1)3=62(-2) - (-1) - 3 = -6. Evaluating the third equation yields 2(2)+2(1)+3=32(-2) + 2(-1) + 3 = -3. Because the substitution produces true mathematical statements for all three equations, the ordered triple (2,1,3)(-2, -1, 3) is confirmed as a valid solution to the overall system.

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Updated 2026-04-25

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