## anonymous one year ago Solve for x. http://static.k12.com/bank_packages/files/media/mathml_ff9880f11e5700b3ac00ce0e219e629e709767af_1.gif

1. anonymous

@Nnesha i think its 8

2. Nnesha

substitute x value to check ur answer if both sides are equal then 8 is right

3. anonymous

oh alright

4. anonymous

2 x 8 - 4 like that?

5. Nnesha

|dw:1434465604776:dw| just like this

6. Nnesha

yep right first multiply and then subtract

7. anonymous

its not right, cause 2(8) -4 = 12 and 2(8) = 16

8. Nnesha

yes right both sides are not equal btw you should reduce the fraction but in this case nope 8 is not correct

9. Nnesha

same like previous one cross multiply :-)

10. anonymous

|dw:1434465831423:dw| thats what i did to get 8

11. Nnesha

alright thanks for showing work i appreciate now easy to start :-) |dw:1434465966222:dw| supposed to be $\huge\rm 2x(10) =20(2x-4)$

12. Nnesha

|dw:1434466031483:dw|

13. anonymous

Ohhh alright so 20x = (2x - 4)

14. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @Acceptfully Ohhh alright so 20x = (2x - 4) $$\color{blue}{\text{End of Quote}}$$ |dw:1434466187130:dw| 20(2x-4) remember cross multiply now distribute parentheses by 20

15. anonymous

is the blue 2x x 10

16. Nnesha

yes right 2x times 10 :-)

17. anonymous

2x(10) =20x right

18. Nnesha

yes right

19. anonymous

20 (2x - 4) _4 -4 16 0 right?

20. anonymous

or did i do it completely wrong

21. Nnesha

nope nope 20(2x-4) is same as 20 Times (2x-4) so multiply everything which is inside the parentheses by outside term

22. Nnesha

$\huge\rm \color{reD}{20}(2x-4) = \color{reD}{20} \times 2x - \color{red}{20 }\times 4$

23. anonymous

20 x 2x = 40x and 20 x 4 = 20 so 40x - 20 would equal 20x right

24. Nnesha

40x is right but 20 times -4 =what ?

25. anonymous

-80

26. Nnesha

yes so $\huge\rm 20x=40x-80$ now solve for x :-)

27. anonymous

|dw:1434466742176:dw| like that?

28. Nnesha

nope you can't combine 20X and -80 there are not LIKE terms so move 40x to the left side so you can combine 2x and 40x

29. anonymous

|dw:1434466920771:dw|

30. Nnesha

yep right $-20x=-80$ LAST STEp solve for x!

31. anonymous

i forgot, do i divided -20x by 2, i forgot

32. Nnesha

goal is to isolate x so u need to cancel out -20 from left side :-)

33. anonymous

|dw:1434467130802:dw| like tht or something

34. Nnesha

nope it's -20 TIMES X so do opposite of multiplication to cancel out -20 from left side

35. anonymous

|dw:1434467252579:dw| im sorry, is this how? im confused

36. Nnesha

$\frac{ -20x }{ ?}= \frac{ -80 }{ ?}$ remember opposite of multiplication is division so you should divide sides by ... ?/

37. Nnesha

goal is to isolate x!!! :-)

38. anonymous

but how do i isolate x

39. Nnesha

divide both sides by -20

40. Nnesha

you need x itself so cancel out -20 from left side to do that we should divide both sides by -20

41. anonymous

sorry, i probably made this harder then it should have been LOL, ok thank you, hold on

42. anonymous

|dw:1434467463164:dw|

43. Nnesha

not just 1 carry down x |dw:1434467556289:dw| and 1x is same as x so x=4

44. Nnesha

you can check your answer by plugging back into the equation both sides equal 1000% sure it's correct :-)

45. anonymous

Ok thank you very much for all of your time, :)

46. Nnesha

np :-)