If 2x + 3y = 12 and x − y = 1, find x.
A1
B2
C3
D4
Answer & Solution
Correct answer: C. 3
From the second equation, x = y + 1. Substitute into the first: 2(y + 1) + 3y = 12 → 5y + 2 = 12 → 5y = 10 → y = 2. So x = 2 + 1 = 3.
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