Show that the given set V is closed under addition and multiplication by scalars and is therefore a subspace of Rº. V is the set of all X y Z such that z = 0. The vector sum a + b is an element of the set V because it addition. (Type an integer or a fraction.) Let c be a scalar. Recall that a = ca = (Simplify your answer.) X y 0 Find the scalar multiple ca. has its third component equal to 0. Therefore, V is closed under

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