September 2019 1 120 Report
Resolva os sistemas abaixo usando os métodos de substituição e adição:

a) x+y=25
2x+3y=55

b)2x+y=40
2x-2y=10

c)4x-y=18
6x+4y=38

d)3x+6y=18
2x+3y=10

e)x+y=17
2x+3y=46

f)3x+2y=28
4x+4y=48
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