If your graphing utility has a ref (row-echelon form) command or a rref (reduced row-echelon form) command, use this feature to verify your work with any five systems that you solved from Exercises 21–38.

Data from Exercise 21-38

21. The solution set is {(1, –1, 2)}.

22. The solution set is {(1, –1, 1)}.

23. The solution set is {(3, –1, –1)}.

24. The solution set is {(–3, 0, 1)}.

25. The solution set is {(2, –1, 1)}.