- #1
cowmoo32
- 122
- 0
Homework Statement
Determine whether the following sets form subspaces of R[itex]^{2}[/itex]
A){([itex]x_{1}[/itex],[itex]x_{2}[/itex])[itex]^{T}[/itex] | [itex]x_{1}[/itex][itex]x_{2}[/itex]=0}
B){([itex]x_{1}[/itex],[itex]x_{2}[/itex])[itex]^{T}[/itex] | [itex]x_{1}[/itex]=3[itex]x_{2}[/itex]}
Homework Equations
checks:
Does zero vector exist?
Is the space closed under addition?
Is the space closed under scalar multiplication?
The Attempt at a Solution
I know B is a subspace, but I'm not sure why. I can check the zero vector and the scalar, but I'm not 100% sure how to define closed under addition.
Also, I know A is not a subspace. Again, I know how to check for the zero vector, but I'm lost on addition and scalar multiplication, at least as a general form.
Last edited: