December 2019 1 45 Report
Resolva os sistemas abaixo:

A) x+y=32
x-y=18

B) 6x-3y=20
4x+3y=40

C) 7x+6y=23
5x-6y=21

D) -2x-3y=11
2x+7y=1

E) -9x-15y=-90
25z+15y=170



ME AJUDEM POR FAVOR!!
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