Final answer:
When adding row 1 to row 3 and then row 3 to row 1 in a matrix, the result is obtained by multiplying row 1 by 2 and adding it to itself.
Step-by-step explanation:
When adding row 1 to row 3 and then row 3 to row 1 in a matrix, we are performing the same operation twice, which means the result will be the same as adding row 1 to itself. This is equivalent to multiplying row 1 by 2 and then adding it to row 1.
For example, let's say we have a matrix:
1 2 3
4 5 6
7 8 9
Adding row 1 to row 3 means the third row will become:
8 10 12
Adding row 3 to row 1 again will be:
9 12 15
So the result of adding row 1 to row 3 and then row 3 to row 1 is:
9 12 15