Respostas

  • Usuário do Brainly
2014-08-28T15:10:05-03:00
P/ y = o

4x + y = 20
4x = 20
x = 20 : 4
x = 5

p/ x = -2

4 . (-2) + y = 20
-8 + y = 20
y = 20 + 8
y = 28