Răspuns :
x+ y = 86
x = 3y + 2
3y + 2 + y = 86 ; 4y + 2 = 86 ; 4y = 86 - 2
4y = 84 ; y = 84 :4 = 21
x = 86 - 21 = 65
solutia 65 si 21
x = 3y + 2
3y + 2 + y = 86 ; 4y + 2 = 86 ; 4y = 86 - 2
4y = 84 ; y = 84 :4 = 21
x = 86 - 21 = 65
solutia 65 si 21