A first number plus twice the second number is 8. Twice the first number plus the second totals 19 find the numbers

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A first number plus twice the second number is 8. Twice the first number plus the second totals 19 find the numbers

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Euphemia 6 months 2021-08-05T00:52:04+00:00 1 Answers 11 views 0

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    2021-08-05T00:54:00+00:00

    Answer:

    The numbers are 10 and -2.

    Step-by-step explanation:

    This question is solved using a system of equations.

    I am going to say that:

    The first number is x

    The second number is y.

    A first number plus twice the second number is 8.

    This means that:

    x + 2y = 8, that is, x = 8 - 2y

    Twice the first number plus the second totals 19

    So

    2x + y = 19

    Since x = 8 - 2y

    2(8 - 2y) + y = 19

    16 - 4y + y = 19

    -3y = 3

    y = -\frac{3}{3}

    y = -1

    x = 8 - 2y = 8 - 2(-1) = 8 + 2 = 10

    The numbers are 10 and -2.

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