Please do 26 using MATLAB.

25. Suppose that vi, V2, ..., Vk are vectors in R. How can we tell from a row-echelon form of the matrix A = [V1 V2 ... Uk] if vi, V2, ..., vk span R? 26. Use the answer to Exercise 25 and one of the gausse- lim, gaussjord, or rref commands of Maple or corre- sponding commands in another appropriate software package to determine if the vectors -3 1 1 1 - - span Rs