Question: Determine whether the following sets form subspaces and justify your answers. (b) {(x, x)T : |x1| = |x2|} in R

Determine whether the following sets form subspaces and justify your answers.

(b) ( left{left(x_{1}, x_{2}ight)^{T}:left|x_{1}ight|=-left|x_{2}ight|ight} ) in ( mathbb{R}^{2} )

(b) {(x, x)T : |x1| = |x2|} in R

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