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26 September, 08:42

How do you solve

X+y=11

Xy=30

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Answers (1)
  1. 26 September, 08:59
    0
    X+y=11

    Xy=30

    x=11-y

    (11-y) y=30

    11y-y²=30

    11y-y²-30=0

    y²-11y+30=0

    y²-5y-6y+30=0

    y (y-5) - 6 (y-5) = 0

    (y-5) (y-6) = 0

    y-5=0

    y=5

    y-6=0

    y=6

    x=11-y

    x=11-5=6

    x=11-6=5

    x=6 y=5

    x=5 y=6
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