Write Freemat code to compute the following 1. A row echelon form of any 3x4 matrix 2. A reduce row echelon form of any 3x4 matrix (you can NOT use the ref) or rref0 command) 3. Note, this is should be only ONE code and should work for three problems below. Use ONLY ONE code above to solve the following system of equations: 71 2rg