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16-01-2020
Mathematics

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

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xviviienx xviviienx

16-01-2020

Answer:

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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