Question: Let A be a 3 3 matrix with a11 = 0 and a21 0. Show that A is row equivalent to I if

Let A be a 3 × 3 matrix with a11 = 0 and a21 ≠ 0. Show that A is row equivalent to I if and only if
-a12a21a33 + a12a31a23 + a13a21a32 - a13a31a22 ≠ 0

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