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Daca x+y=36 si x-y=12 Aflati x si y.

Răspuns :

x+y=36

x-y=12⇒x=12+y

12+y+y=36

12+2y=36

2y=24

y=12

x=12+y

x=12+12

x=24

Răspuns

x=12+y

inlocuim:

12+y+y=36

2y=36-12

2y=24

y=12

x=12+y=12+12=24