- #1
Aerosion
- 53
- 0
Homework Statement
Let A =
[2 -1 9]
[1 0 5]
[0 1 1]
Find solution space W and prove that W is a subspace of R^3.
Homework Equations
The Attempt at a Solution
rref=
[1 0 5]
[0 1 1]
[0 0 0]
So I know the row-echeleon form, which is what I suppose is the solution space. But how do you prove that it's a subspace of R^3? Using the vector space axioms? How do you use those on this kind of matrix?