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16 September, 19:11

If x+y=15 and x-y=-19 then what does xy=?

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  1. 16 September, 21:54
    0
    xy=34

    Step-by-step explanation:

    Use elimination:

    x+y=15

    x-y+-19

    2x=-4

    x=-2

    Plug - 2 into x

    -2+y=15

    y=17

    17 multiplied by - 2 is 34

    I dont know if you mean (x, y) or not but the answer to that would be (-2, 17).
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