If 5a + 2b = 19 and a - b = 1, find a:
A2
B3
C4
D5
Answer & Solution
Correct answer: B. 3
From second: a = b + 1. Sub into first: 5(b+1) + 2b = 19 → 7b + 5 = 19 → 7b = 14 → b = 2, so a = 3.
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