RESOLVER LOS SIGUIENTES SISTEMAS DE ECUACIONES APLICANDO EL METODO DE SUSTITUCION 2x +3y = 2 -6x + 12y = 1

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RESOLVER LOS SIGUIENTES SISTEMAS DE ECUACIONES APLICANDO EL METODO DE SUSTITUCION
2x +3y = 2
-6x + 12y = 1

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Thu Hương 1 month 2021-08-08T17:58:23+00:00 1 Answers 2 views 0

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    2021-08-08T17:59:54+00:00

    Answer:

    x = 1/2; y = 1/3

    Step-by-step explanation:

    2x + 3y = 2     Eq. 1

    -6x + 12y = 1     Eq. 2

    Eq. 1

    2x + 3y = 2

    2x = -3y + 2

    x = -3/2 y + 1

    Eq. 2

    -6x + 12y = 1

    De Eq. 1 sabemos que x = -3/2 y + 1

    -6x + 12y = 1

    -6(-3/2 y + 1) + 12y = 1

    9y – 6 + 12y = 1

    21y – 6 = 1

    21y = 7

    y = 7/21

    y = 1/3

    Eq. 1

    2x + 3y = 2

    2x + 3(1/3) = 2

    2x + 1 = 2

    2x = 1

    x = 1/2

    Respuesta: x = 1/2; y = 1/3

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )