Question

Solve the system by elimination.
x + 5y - 4z = -10
2x - y + 5z = -9
2x - 10y - 5z = 0

Answer 1

put it in a matrix:
1 5 -4 | -10
2 -1 5 | -9
2 -10 -5 | 0
and solve

Answer 2

how do i slove? these are the answers i have
(5, –1, 0)
(–5, 1, 0)
(–5, –1, 0)
(–5, –1, –2)

Answer 3

use gauss jordan method

Answer 4

I have no idea how to use that.... its confusing