Question

??? qual resposta? gente me ajudem

Answer 1

2+2=4

2+2x2 = 6

Resposta : D

Answer 2

d)x + y = 7
   x - y = 1
--------------
   2 x = 8
x = 8/2
x = 4
x + y = 7
4 + y = 7 
y = 7 - 4
y = 3
S = {x = 4 e y = 3 }

e)x + y = 4  ⇒x = 4 - y
x + 2 y = 6
4 - y + 2 y = 6
y = 6 - 4
y = 2
x + y = 4
x + 2 = 4
x = 4 - 2
x = 2
x = 2 e y = 2

x - y = 
2 - 2 = 0
letra e) 0