if x0 is any solution of a consistent linear system Ax =b, and if S = {v1,v2 ... vk} is a basis for the null space of A

then every solution of Ax = b can be expressed in the form

x = x0 + c1v1 + c2v2 + ... ckvk

conversely, for all choices of scalars c1, c2 ... ck the vector x in this formula is a solution of Ax = b


뭘 말하는 건지 감이 안옴


그리고 null space가 직관적으로 뭔지 설명 가능?