Question 532859
multiply r1 by -2 and add to r2; multiply r1 by 3 and add to r3


x + 2y + 3z = 3
___-y - 2z = -4
___ y + 11z = 13


multiply r2 by 2 and add to r1; add r3 to r2


x  ___  - z = -5
___ ___ + 9z = 9
___ y + 11z = 13


divide r2 by 9 and add to r1; multiply r2 by -11/9 and add to r3; divide r2 by 9


x ___  ___ = -4
___ ___ + z = 1
___ + y ___ = 2