Let $W = \langle(1,-1,2,1)\rangle$ and $V = \{(x,y,z,t)\ |\ x+y-z-t=0\}$ be subspaces of $\mathbb{R}^4$. What is the basis for $V+W$ and $V\cap W$?
What is the basis for $V+W$ and $V\cap W$?
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linear-algebra