Question

how would you solve a matrix if there is a zero underneath the pivot position?

Answer 1

can you give an example?

I know there are row operations
1. you can swap rows
2. you can multiply a row by a number
3. you can add 2 rows to create a new row that will replace the one of the old rows.

Answer 2

that's just REF - row echelon form... if you want RREF (reduce row echelon form) you must have 0's above and below the 1 [similar to an identity matrix]

Answer 3

k example:
row 1: 1 5 7 9
row 2: 0 4 1 7
row 3: 2 -2 11 -3

Answer 4

nvm got it but thanks

Answer 5

that 0 isn't doing anything wrong... as long as you don't have a 0 in the main diagonal...which breaks one of the rules... you must have a 1 on the top left corner