matrix compare to the matrix in part a?

d) Solve Ux=y for x using the \ function, and U and y from part c.

Problem #3) Given the linear system Ax=b where, [1 2 1 4| 6 3 1 [5 b=13 71 A=14 5 a) Write a code to create an upper triangular matrix U from the matrix A (Hint: you can use the function uptri.m provided.) b) Solve for x using "back substitution" function. c) Create an upper triangular matrix U from the matrix A using the MATLAB function "lu". Refer to the MATLAB help for more information about this function. How does this