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## Homework Statement

im having problems with this question, i dont know how they got their answer. the question is: find elementary matrix E such that B=EA

A=-1 2 B= 1 -2 (these are matrices)

0 1 0 1

## Homework Equations

elementary row operations

## The Attempt at a Solution

-1 2|1 0 (row 1x-1) 1 -2|-1 0 (row 1+2 row 2) 1 0|-1 2

0 1|0 1 0 1|0 1 0 1|0 1

the answer in my book says its -1 0 but i dont know how they got that

0 1