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ParkKethlynKook
@ParkKethlynKook
November 2019
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Resolva:
x+y=12
x-y=2
x=2y
x+y=12
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PauloBarros
A) Adição: x + y =12 / x - y =2 (+) = ; 2x. = 14; x = 14/2; x =7; x + y =12; 7 + y =12; y = 12 - 7; y =5; b) Substituição: x = 2y; x + y =12; 2y +y = 12; 3y =12; y = 12/3; y = 4; x=2y; x = 2.4; x =8
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