||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
#2
A2= matrix([[4,-1,0],[-1,4,-1],[0,-1,4]])
b2= vector([21,-45,33])
x2= A2.solve_right(b2)
print x2
}}}

/* code_ends */

 * '''Solution by''': 
   * Swati Ahuja, Student, IIT Roorkee