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24 September, 21:12

How to solve for 3x y=23

3x-2y=8

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Answers (1)
  1. 24 September, 23:36
    0
    {x, y} = {6,5}

    Step-by-step explanation: 3x + y = 23

    3x - 2y = 8

    Solve by Substitution:

    / / Solve equation [1] for the variable y

    y = - 3x + 23

    / / Plug this in for variable y in equation

    3x - 2• (-3x+23) = 8

    9x = 54

    / / Solve equation [2] for the variable x

    9x = 54

    [ x = 6

    / / By now we know this much:

    x = 6

    y = - 3x+23

    / / Use the x value to solve for y

    y = - 3 (6) + 23 = 5

    Solution:

    {x, y} = {6,5}
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