What is the dimension of span of a vector orthogonal to 'n' linearly independent vectors?

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So let's say I have "n" linearly independent vectors in "m" dimensions (m > n). Is it true that the dimension of span of these n vectors is also n? And if I find a vector orthogonal to all the n vectors, what will be the span of combined system of the n vectors and the orthogonal vector? n+1? If yes, how can I prove it?