Exercise 5. Give, for each of the following sets, a reason why it is not a vector subspace. 1. E = {(x, y, 2) E R/a+ y+32 = 2}. 2. F = {(r, y) E R² / xy = 0}. 3. G = {(x, y) € R²/ y = a?}. %3D %3D %3D

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