## bonjovifan03 2 years ago Solve for x using the addition principle: -8+x= -24 would that be -8x=-24 which equals 3?

1. cwrw238

you add 8 to each side of the equation -8 + x + 8 = -24 + 8

2. cwrw238

what happens to the lefthand side? - what does it simplify to?

3. cwrw238

-8 + 8 = ?

4. bonjovifan03

16

5. cwrw238

no - 8 + 8 = 8 - 8 = 0

6. cwrw238

take the thermometer analogy: |dw:1359325143283:dw|

7. bonjovifan03

Sorry Im lost not good at this I need a tutor plus go back to grade school.

8. cwrw238

the temperature is -8 degrees then it rises 8 degrees to give 0 degrees 8 degrees is 'added'

9. cwrw238

do you see how the diagram relates to -8 + 8 = 0 ?

10. cwrw238

the reason I added 8 to left side was so we would only have x left -8 + 8 + x = 0 + x = x

11. bonjovifan03

yes I understand when you do it, but get frustrated when I try to do it my self.

12. cwrw238

practice simple examples and you'll gain confidence remamber to do the same operation ( + 8) to both sides of the equation an equation is like a balance

13. bonjovifan03

OK now we have x left so then it would be X=-24+8 I will ty.

14. cwrw238

right

15. cwrw238

|dw:1359325718145:dw|

16. bonjovifan03

so we still add 24+8 right?

17. cwrw238

no we add 8 to minus 24 (-24) check out the thermometer

18. cwrw238

if we add 1 to -24 that is go up 1 degrree it gets to -23 right?

19. cwrw238

and add 1 more dgree we get -22 right so what do we get to if we 8 to -24?

20. cwrw238

does that help?

21. bonjovifan03

so we would have -16?

22. bonjovifan03

if I look at your nice graft thats what I come up with.

23. cwrw238

right -16 is correct so we get x = -16 - though i dont think my graph is all that nice!! lol

24. bonjovifan03

so do I have to figure what x is yet or is that simplified enough?

25. cwrw238

no thats it x = -16 in algebra you need to get used to negative values and how to manipulate them

26. cwrw238

the solution to the equation is x = -16

27. bonjovifan03

I will for sure use your graft, because it makes sense to me.

28. bonjovifan03

OK I hope I can get use to this yikes....

29. bonjovifan03

ty for being patient with me :0) I need a drink now lol

30. cwrw238

ok remember that everything below the x ( horizontal axis) is negative also everything to left of the y-axis is negative |dw:1359326605166:dw|

31. bonjovifan03

OK ty so much...