January 2020 1 140 Report
Equações de 1 grau
1) Calcule os sistemas
A) x-3y=1
2x+5y=13

B) 2x+v=10
x+3y=15


C) 3x+v=13
2x-y=12


d) 2x+7y=17
5x-y=-13
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