What is the solution to this system of linear equations?x + y = 4x − y = 6

Add the equations x + y = 4 and x − y = 6. The y terms cancel, giving 2x = 10, so x = 5. Substitute into x + y = 4: 5 + y = 4, so y = −1. The solution is (5, −1), choice C.

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