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Three linear equations in x, y and z are written as AX = B. What are the orders of A, X and B?
A3 by 3, 3 by 1, 3 by 1
B3 by 1, 3 by 3, 3 by 1
C3 by 3, 1 by 3, 3 by 1
D3 by 3, 3 by 3, 3 by 3
Answer & Solution
Correct answer: A. 3 by 3, 3 by 1, 3 by 1
A holds nine coefficients in a square array, while X and B are single columns of three entries.
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