Here's the question you clicked on:
liliy
MATRIX: 2 4 6 -8 3 6 7 10
reduce it. to be 1000 01000 form
i got: 1 2 0 -1 0 0 1 -1. is this correct?
almost, the -1 on the first row should be 29 and the -1 in the bottom should be -11.
Its tedious work, but here's the calculator answer http://www.wolframalpha.com/input/?i=row+reduce%7B%7B2%2C4%2C6%2C-8%7D%2C%7B3%2C6%2C7%2C10%7D%7D.