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March 26, 2017

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0.3x + 0.2y=5, 0.5x + 0.4y=11 using the substitution method

  • intermediate algebra - ,

    .3x + .2y = 5
    so
    3x + 2y = 50
    y = 25 - 3x/2

    .5x + .4y = 11
    5x + 4y = 110
    5x + 4(25 - 3x/2) = 110
    5x + 100 - 6x = 110
    -x = 10

    x = -10
    y = 40

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