O Show that the following set of matrices is closed under linear combina- tions. a + 2b a+b a b -{(a + 2b a-3 "5") = a,bER}. : 3b 0 S₁ = i.e. Show that c₁ M₁ + c₂M₂ E S₁ for all choices M₁, M₂ E S₁ and all scalars C₁, C₂ € R.

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