Elementary Matrices If we perform a single row operation on an identity matrix, we obtain an elementary matrix EInt, ERepl, or EScale. Find the elementary matrices for each of the following row operations on I3.
(a) Interchange rows 1 and 2 (EInt).
(b) Add k times row 1 to row 3 (ERepl).
(c) Multiply k times row 2 (EScale).
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