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Two linear equations in x and y have a unique solution when which holds?
Aa1b2 - a2b1 ≠ 0
Bc1 - c2 ≠ 0
Ca1b2 - a2b1 = 0
Da1b1 - a2b2 > 0
Answer & Solution
Correct answer: A. a1b2 - a2b1 ≠ 0
For a1x + b1y = c1 and a2x + b2y = c2 the coefficient determinant a1b2 - a2b1 must be nonzero.
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