Solve for x & y...3

Discussion in 'Other Pre-University Math' started by nycmathguy, Jun 24, 2022.

  1. nycmathguy

    nycmathguy

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    IMG_20220624_181908.jpg
     
    nycmathguy, Jun 24, 2022
    #1

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  2. nycmathguy

    MathLover1

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    incorrect

    no solution exist
     
    MathLover1, Jun 24, 2022
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  3. nycmathguy

    nycmathguy

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    Ok. I tried. Can you prove why I am wrong?
     
    nycmathguy, Jun 25, 2022
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  4. nycmathguy

    MathLover1

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    you say y=25 and x=1/2

    use determinants, prove they are equal

    80(1/2)-(-4*y)=25*5.2-x*0
    substitute x and y
    80(1/2)+4*25=25*5.2-(1/2)*0
    80(1/2)+4*25=25*5.2-(1/2)*0
    140=130 => false
     
    MathLover1, Jun 25, 2022
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  5. nycmathguy

    nycmathguy

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    I knew there was something not right here.
     
    nycmathguy, Jun 25, 2022
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