46 0 x b Write 2 7 2 Problem 4 We learned how to use Gaussi

4-6 0 x = b. Write -2 7 2 Problem 4 We learned how to use Gaussian elimination to solve down the matriz that produces each elimination step in the process.

Solution

a. True

E21 and E31 commute (E21E31 = E31E21) since adding a multiple of row 1 to row 2

and adding a multiple of row 1 to row 3 can be done in any order without affecting the

result

b. True