QUESTION 2.20. (Easy; Z. Bai) Given an n-by-n nonsingular matrix A, how do you efficiently solve the following problems, using Gaussian elimination with partial pivoting? e) Salve the inear systemAznb, where k i s potitive intag (b) Compute = cTA-1b. (c) Solve the matrix equation AX = B, where B is n-by-m. You should (1) describe your algorithms, (2) present them in pseudocode (using a Matlab-like language; you should not write down the algorithm for GEPP), and (3) give the required flops