alleryIf x + y = 12 and x - y = 4, then xy equals
A28
B30
C32
D36
Answer & Solution
Correct answer: C. 32
Add: 2x = 16, x = 8. Subtract: 2y = 8, y = 4. xy = 32. Verify: 8 + 4 = 12; 8 - 4 = 4.
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