## anonymous one year ago Help

1. anonymous

@Michele_Laino

2. Michele_Laino

starting from inequality: $$8<2b$$ I can divide both sides by $$2$$ so I can write this: $\frac{8}{2} < \frac{{2b}}{2}$ please simplify

3. anonymous

How? :3

4. Michele_Laino

what is 8:2=...?

5. anonymous

what does ":" mean?

6. Michele_Laino

I mean 8 divided by 2

7. anonymous

4

8. Michele_Laino

ok! now, what is 2/2=...?

9. anonymous

1

10. Michele_Laino

ok! so that inequlity is equivalent to this one: $$4<b$$, which caqn be rewritten as below: $$b>4$$

11. Michele_Laino

inequality*

12. anonymous

so then that would be it?

13. Michele_Laino

oops.. can*

14. Michele_Laino

please wait, we have to rewrite the second your inequality: $$2b+15<5$$

15. anonymous

Oh

16. Michele_Laino

If I subtract 15 to both sides I get: $$2b+15-15<5-15$$ please simplify

17. anonymous

How would I simplify that?

18. anonymous

keep in mind...since there are no equal signs in your inequalities, that means that the circles are open....that will automatically eliminate 2 of them

19. Michele_Laino

what is: 15-15=...? and what is 5-15=...?

20. anonymous

0 and -10?

21. Michele_Laino

ok!

22. anonymous

:D

23. anonymous

what do you do with the 2b?

24. Michele_Laino

so we get: $$2b<-10$$ now I divide both sides by 2, so I write this: $\frac{{2b}}{2} < \frac{{ - 10}}{2}$

25. Michele_Laino

what is 2/2=...? and what is -10/2=...?

26. Michele_Laino

hint: we get $$b<-5$$

27. Michele_Laino

so your set is represented by these inequalities: $$b>4$$ $$or$$ $$b<-5$$