1. ## Math proof help

This is probably terribly easy for most of you, but I am stuck on a proof, maybe someone could help me!

Prove: a,b are R. If a<b, then -b<-a.

Would I use the additive inverse here?
l

2. Originally Posted by jujab
This is probably terribly easy for most of you, but I am stuck on a proof, maybe someone could help me!

Prove: a,b are R. If a<b, then -b<-a.

Would I use the additive inverse here?
l
I assume you mean the fact that a+ (-a)= 0. Yes, add a+ b to both sides of the inequality.

3. Originally Posted by HallsofIvy
I assume you mean the fact that a+ (-a)= 0. Yes, add a+ b to both sides of the inequality.
Do you mean add $-(a+b)$ to both sides of the inequality?