Find a basis for the subspace of R³ spanned by S. S = {(5, 9, 9), (1, 3, 3), (1, 1, 1)} STEP 1: Find the reduced row-echelon form of the matrix whose rows are the vectors in S. ↓ 1 X STEP 2: Determine a basis that spans S. X ↓ ↑

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