Respostas

2013-10-07T23:07:22-03:00
2x-3.3x =
2x - 9x =7
-7x = 7
x 7/-7
x = -1

  • Usuário do Brainly
2013-10-07T23:09:31-03:00
3x = y
2x - 3y = 7
-------------
2x - 3.(3x) = 7
2x - 9x = 7
- 7x = 7 .(-1)
7x = - 7
x = -7/7
x = -1
---------
y = 3x
y = 3.(-1)
y = -3
-----------
S = { -1, -3 }