Hi
I need help in solving a question involving row operations by converting the equations in a matrix.
i have attached the question
thank you
write the augmented matrix of the system and do the row operations until your matrix is in an echelon form, which is: $\displaystyle \begin{bmatrix}1 & 1 & 1 & | & 1 \\ 0 & -1 & -3 & | & -1 \\ 0 & 0 & a-4 & | & 0 \end{bmatrix}.$ you should be able to finish the proof now.