# Thread: Proving an inequality #2.

1. ## Proving an inequality #2.

Given that a and b are positive numbers, c and d are negative numbers, and a > b, c > d, then show that a/c < b/d

2. Originally Posted by rcs
Given that a and b are positive numbers, c and d are negative numbers, and a > b, c > d, then show that a/c < b/d
This is equivalent to showing that for $u,v,w,x$ all positive with $u>v$ and $w that $u/w>v/x$

CB

3. sir i'd like to see how it is being done... i mean the proof.. the sequence of the it's proof. thanks

4. Wouldn't it be better to learn how to do it yourself? You learn mathematics by doing mathematics. Not by watching someone else do mathematics.

If c> d and c is negative, then 1< d/c. Do you see why? If d is also negative then 1/d> 1/c. That's what you need to do to prove this.

5. i needed help from you sir becoz i dnt know how... it was given us as assignment... sorry

6. Originally Posted by rcs
i needed help from you sir becoz i dnt know how... it was given us as assignment... sorry
In that case, your teacher will expect the solution you hand in to be your work, not someone elses work.