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8 January, 19:47

solve this system of linear equations. separate the x - and y-values with a comma. - 12x = - 75 - 11y - 5x = - 89 - 11y

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  1. 8 January, 23:46
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    x = - 2, y = - 9

    Step-by-step explanation:

    Solve the following system:

    {-12 x = - 11 y - 75 | (equation 1)

    {-5 x = - 11 y - 89 | (equation 2)

    Express the system in standard form:

    { - (12 x) + 11 y = - 75 | (equation 1)

    { - (5 x) + 11 y = - 89 | (equation 2)

    Subtract 5/12 * (equation 1) from equation 2:

    { - (12 x) + 11 y = - 75 | (equation 1)

    {0 x + (77 y) / 12 = (-231) / 4 | (equation 2)

    Multiply equation 2 by 12/77:

    { - (12 x) + 11 y = - 75 | (equation 1)

    {0 x+y = - 9 | (equation 2)

    Subtract 11 * (equation 2) from equation 1:

    { - (12 x) + 0 y = 24 | (equation 1)

    {0 x+y = - 9 | (equation 2)

    Divide equation 1 by - 12:

    {x+0 y = - 2 | (equation 1)

    {0 x+y = - 9 | (equation 2)

    Collect results:

    Answer: {x = - 2, y = - 9
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