Ajuda - problema de sistema de equação de 1º grau (10pts)?

A soma do dobro de um numero com a metade de outro da 53. calcule esses numeros, sabendo que a diferença entre o primeiro numero e o triplo do segundo é igual a sete

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Answers & Comments


  • Anonymous
    10 years ago

    2x + y/2 = 53

    x - 3y = 7 ---> x = 7 + 3y

    2(7 + 3y) + y/2 = 53

    14 + 6y + y/2 = 53 MMC = 2

    28 + 12y + y = 106

    13y = 106 - 28

    13y = 78

    y = 78/13

    y = 6

    x = 7 + 3y

    x = 7 + 3*6

    x = 7 + 18

    x = 25

  • 10 years ago

    2x+y/2=53

    x-3y=7

    4x+y=106

    x-3y=7,---->x=7+3y

    4(7+3y)+y=106

    28+12y+y=106

    13y=106-28

    13y=78

    y=78/13

    y=6

    x=7+3y

    x=7+3*6

    x=7+18

    x=25

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