Question

x+y=12
3× -4=20

gente me ajuda pelo amor de Deus!!​

Answer 1

Resposta:

x=12-y

3 (12-y)-4=20

36-3y-4=20

-3y=20-32

-3y=-12

3y=12

y=12/3

y=4 ×=12-4 ×=8