Răspunsuri

2014-10-28T19:07:37+02:00
A) x+3y-3z = (x+2y)+(y-3z)=17+4=21.
b) 2x+5y-3z = 2(x+2y) + (y-3z)=2*17-4=30.

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2014-10-28T19:11:16+02:00
A) x+2y=17 |+y-3z
  x+2y+y-3z=17+4
  x+3y-3z=21.

b)  x+2y=17 | x2
   2x+4y=34 | +y-3z
   2x+4y+y-3z=34+4
   2x+5y-3z=38

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