1. The problem statement, all variables and given/known data Does b = [ 2 15 ]T lie in the column of the matrix A [1 -3] [2 5] 2. Relevant equations a basis of CS(U) forms a basis for the corresponding columns for CS(A) 3. The attempt at a solution I reduced the given matrix into row echelon form and determined its column space. But did not figure out if [2 15]T lies in the column space of A.