Respostas

  • Usuário do Brainly
2014-02-26T15:46:16-03:00
X=3+7=10
10+y=7
y=7-10=-3

b) x=2-y
2(2-y)-y=1
4-2y-1y=1
4-3y=1
4-3y-1=0
3-3y=0
y=-3/-3
y=1

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