Question

dado o sistema [x+y=28]
[x=3y] a soluçao e ?​

Answer 1

Resposta:

[x+y=28]. 3y+y= 28. x=3y

[x=3y]. 4y= 28. x= 3(7)

y= 28/4. x= 21

y= 7

(21;7). x= 21. y= 7