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math

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2x+5y=10 , -7x-4y=16

  • math - ,

    Are solving ?

    1st times 4 ----> 8x + 20y = 40
    2nd times 5 ---> -35x - 20y = 80

    add them
    -27x = 120
    x = -40/9

    into the 1st:
    -80/9 + 5y = 10
    -80 + 45y = 90
    45y =170
    y = 34/9

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