Solve the system: x + y = 10, x − y = 4
Ax = 7, y = 3CORRECT
Bx = 8, y = 2
Cx = 6, y = 4
Dx = 5, y = 5
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Why the answer is A, and why the others tempt you.
Adding: 2x = 14 → x = 7; y = 10 − 7 = 3.
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