## celinegirl one year ago Math Question: Solve −np − 80 < 60 for n.

1. celinegirl

anyone? :( need help.

2. anonymous

where are you stuck?

3. celinegirl

@peachpi just the whole problem I don't understand.

4. anonymous

you're trying to get n by itself. Think reverse PEMDAS. The first thing you have to do is move the 80 to the other side. the 80 is subtracted, so to move it you need to ADD 80 to both sides of the inequality

5. celinegirl

Oh! Okay I understand the reverse part, but I never really understood where you have to add the number to both sides of the inequality.

6. celinegirl

@peachpi sorry forgot to tag you

7. anonymous

when you add, the 80 on the left will cancel. On the right, what's 60 + 80

8. celinegirl

@peachpi 140

9. anonymous

right. show me what your inequality looks like now. I just want to make sure we're on the same page

10. celinegirl

@peachpi wait im still confused

11. anonymous

we added 80 to both sides|dw:1444403350937:dw|

12. anonymous

now you should have this|dw:1444403417956:dw|

13. celinegirl

@peachpi ah okay! I understand now!

14. anonymous

so now divide both side by $$-p$$, and flip the $$<$$ sign to $$>$$ since you're dividing by a negative

15. anonymous

|dw:1444403666243:dw|

16. anonymous

$n>-\frac{ 140 }{ p }$

17. celinegirl

@peachpi Oh okay! I get it. what would the answer be?

18. anonymous

19. celinegirl

@peachpi oh lol. I thought it would of just been a single number. As you can tell im not very good at math. Thank you so much for your help!(:

20. anonymous

you're welcome