Math

y-4=4x+3y=-(9-x)
What is the value of xy?

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  1. what are we to make of the two = signs?

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  2. I believe it's like:
    y-4=4x+3y
    y-4=-(9-x)
    4x+3y=-(9-x)

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  3. well, then we have

    y-4 = 4x+3y
    2y = -4x-4
    y = -2x-2

    y-4 = -(9-x)
    y-4 = x-9
    y = x-5

    So,

    -2x-2 = x-5
    x = 1
    and thus y = -4

    xy = -4

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