What is the 1 by 1 row matrix column 1 cap A sub x in the given system? 4 x minus y is equal to negative 3 negative 2 x plus y is equal to 5

To form Aₓ, replace the x-coefficient column of the system’s coefficient matrix with the constants on the right-hand side. The constants are −3 and 5, and the y-coefficients are −1 and 1, so Aₓ = [[−3, −1], [5, 1]]. This is choice B.

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