- A3
- B6
- C−6
- D2
Step-by-Step Solution
Infinitely many solutions need a₁/a₂ = b₁/b₂ = c₁/c₂. Here 2/4 = 1/2 and 5/10 = 1/2, so 3/k = 1/2 gives k = 6 (the second equation is then just twice the first).
Answer: B) 6
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