November 2019 1 69 Report
Resolva os sistemas a seguir com o método de substituição :

a)
x + y = 5 \\ x - y = 1

b)
x - 2y = 3 \\ 2x - 3y = 5
c)
x - 3y = 1 \\ 2x + 5y = 13
Ajudem Ai
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