Hello, i have a problem that asks me to put in reduced row echelon form and I have no clue how to even begin.

Let A be a 4X5 matrix. If a1,a2,a4 are linearly independent and

a3=a1-3a2

a5=a1-2a2-3a4

determine the reduced row echelon form of A.

Any help is greatly appreeciated.

Thank You,

Diggidy