Question

Determinati numerele naturale x y z care indeplinesc conditiile: x-y+2z=15,x+z=17,3y+z=14 va rog ajutati-ma

Answer 1

Răspuns:

x-y+2z=15

x+z=17=>x=17-z=>x=17-14+3y=>x=3+3y

3y+z=14=>z=14-3y

3+3y-y+2(14-3y)=15

3+2y+28-6y=15

4y=31-15=>y=16:4=>y=4

x=3+12=>x=15

z=14-12=>z=2