x+y=60
60x+20y=210 As dori ajutor


Răspuns :

x+y=60
60x+20y=210 l:10

x+y=60  l *(-2)
6x+2y=21

-2x-2y=-120
6x+2y=21
Adunam relatiile:
4x=-99
x=-99/4
y=60-x
y=60+99/4
y=339/4