Day 17 ✅| Subspace, Basis, Dimension

29 the dimension of the subspace W={(x,y,z,w)∈R^4 |x+y+z+w=0,x+y+2z=0,x+3y=0}

08 linear algebra | vector space | subspace in R3(R) | How to check subspace in vector space

27 linear algebra| how to check given vector space is subspace