by Dibbo Halder
Last Updated August 09, 2018 05:20 AM

If $(-x,-y)$ is in 4th quadrant, then which option or options are true?

A) $1/x<1/y$

B) $(1/x)+(1/y)>0$

C) $(1/x)-(1/y)>0$

D) $(1/x)-(1/y)<0$

E) $(1/x)+(1/y)<0$

Hints:

- Do you see any connection between $x$ and $y$? (Just because they happen to share the same quadrant). [see options which depends on the answer]
- If $(-x, -y)$ is in the 4$^{th}$ quadrant, where $(x,y)$ could be? What does this say about their sign?
- Try some numbers. Like take two numbers in the 4$^{th}$ quadrant, $(3, -1)$ and try to fit them into some inequalities. This could help "visualize" impossible answers.

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