1. The problem statement, all variables and given/known data Find a basis for each of these subspaces of R4 All vectors that are perpendicular to (1,1,0,0) and (1,0,1,1) 2. The attempt at a solution I'm not sure how to approach this question. The only thing I can think of is that a vector that would be perpendicular to both would be where the dot product would equal zero aye? So then that would give me 1x1 + 1x2 = 1x1 + 1x3 + 1x4 = 0. So in which case, I'd do RREF [[1,1,0,0] [1,0,1,1]] to [[1,0,1,1] [0,1,-1,-1]] I get stuck here because I'm not sure how to solve for the basis at this point. I'm also unsure if what I did for rref was correct because vectors are usually denoted by column spaces, rather than what row spaces such as what I have done.