B. A new algorithm is now proposed to solve the linear system Rx = b.

It is in four steps:

Step A. Let x = Sy to get R Sy = b.

Step B. Multiply both sides of R Sy = b by ST to write ST R Sy = STb = c or Py = c.

Step C. Solve Py = c to obtain y.

Step D. Compute x as x = Sy.

Show the computations performed at each step when the data vector b =

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