# Splitting a matrix

Dear SAGE community, I am looking for a way that can help me split this matrix, A A = matrix([[x], [x - 2*y]]), which is a linear combination of variables x, and y

into a Coefficient matrix, C = matrix([[1, 0], [1, -2]]) times the vector containing independent variables b = matrix([[x], [y]]). Basically, A = C*b.

If there's a way to obtain the matrix C, would be really helpful.

-TIA