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## Homework Statement

Consider the following 3 row operations performed to a 4x3 matrix A used to transform it into matrix B:

E1: -4R1+R4-> R4

E2: R2<->R3

E3: (1/2)R4-> R4

From there I am asked to find E1, E2, E3.

## The Attempt at a Solution

I assumed the identity matrix I would start out with was

1 0 0

0 1 0

0 0 1

0 0 0

and then by using E1 the matrix would become

1 0 0

0 1 0

0 0 1

-4 0 0

However, the answer was counted wrong. Am I approaching the question the wrong way or am I using the wrong identity matrix?