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matematica

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( 3x+5y =15,30) (6x+2y)=16,20
x ?
y ?
thanks

  • matematica - ,

    double the first
    6x + 10y = 30.6
    6x + 2y = 16.2 , the second
    now subtract them
    8y = 14.4
    y = 1.8

    back in first
    3x + 5(1.8) = 15.3
    3x = 6.3
    x = 2.1

    x=2.1 , y=1.8

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