Question

If xy<0, which of the following must be true?
I. x + y = 0
II. 2y - 2x < 0
III. x2 + y2 > 0​

Answer 1

1.false

2.true

3.false

Answer 2

Answer:

(III)

$x ^{2} + y ^{2} > 0.$

It must be true.

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