csat-suneung 2005 Q2

csat-suneung · South-Korea · csat__math-science 2 marks Matrices Linear System and Inverse Existence

For two matrices $A = \left( \begin{array} { l l } 1 & 2 \\ 2 & 5 \end{array} \right) , B = \left( \begin{array} { l l } 2 & - 3 \\ 1 & - 2 \end{array} \right)$, what is the sum of all components of matrix $X$ that satisfies $A X = B$? [2 points]
(1) - 2
(2) - 1
(3) 0
(4) 1
(5) 2

For two matrices $A = \left( \begin{array} { l l } 1 & 2 \\ 2 & 5 \end{array} \right) , B = \left( \begin{array} { l l } 2 & - 3 \\ 1 & - 2 \end{array} \right)$, what is the sum of all components of matrix $X$ that satisfies $A X = B$? [2 points]\\
(1) - 2\\
(2) - 1\\
(3) 0\\
(4) 1\\
(5) 2

Paper Questions

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