Hi, I'm trying to solve the following problem:

"SolveXA=Bfor A using matrix algebra, where Bis a n x 1

vector, X is a n x k matrix, and A is a k x 1 vector. You can assume that

any square matrices that you encounter have full rank."

Usually this could be solved easily just by multiplying by the inverse of X, but since X is not a square matrix, I don't know what to do.

Thanks!