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

/* code_begins */

{{{
A=matrix([[4,0,2],[0,1,4],[0,0,5]])
Ain = A.inverse()
y1, y2,y3 = var('y1,y2,y3')
y = matrix([[y1],[y2],[y3]])
Ain*y
}}}

/* code_ends */

 * '''Solution by''': 
   ganesh, developer, space
   bhanukiran, student, technical university of Delft