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A pair of equations gives a single solution iff:
Aall ratios equal
Ba₁/a₂ = c₁/c₂
Ca₁/a₂ = b₁/b₂
Da₁/a₂ ≠ b₁/b₂
Answer & Solution
Correct answer: D. a₁/a₂ ≠ b₁/b₂
Unique solution corresponds to non-parallel lines, which happens when the coefficient ratios of x and y differ: a₁/a₂ ≠ b₁/b₂.
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