Solve simultaneously: x + y = 10, x - y = 4
Ax=6, y=4
Bx=7, y=3CORRECT
Cx=4, y=6
Dx=5, y=5
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Why the answer is B, and why the others tempt you.
Add: 2x = 14 → x = 7; y = 10 - 7 = 3.
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