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Vanity... 4 [4 - 5x] = 6x + 4
high school ^ | n/a | n/a

Posted on 01/09/2012 9:45:26 PM PST by The SISU kid

I know there a a lot of FReepers smarter than I, so here goes...got this presented to me for help & I for the life of me am stumped

4 [4 - 5x] = 6x + 4

says answer is x= 10/7

can someone show how to solve?

Thanks in advance....


TOPICS: Cheese, Moose, Sister; Education
KEYWORDS: algebra; highschoolmath; math
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1 posted on 01/09/2012 9:45:29 PM PST by The SISU kid
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To: The SISU kid

4 [4 - 5x] = 6x + 4
16-20x = 6x + 4
16 -4 = 20x + 6x
12 = 26x
12/26 = x
6/13 = x


2 posted on 01/09/2012 9:50:23 PM PST by FrogMom (There is no such thing as an honest democrat!)
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To: The SISU kid

I get x = 6/13.

Multiply-out the left side, add 20x to each side, subtract 4 from each side, divide-through by 26. x = 12/26, simplifying to 6/13.


3 posted on 01/09/2012 9:50:40 PM PST by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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To: The SISU kid

4 [4 - 5x] = 6x + 4

Rearrange to get X on one side of the equation.

4*4 - 5*4*x = 6x + 4

6x - 5*4*x = 4 - 4*4

(6 - 5*4 ) x = 4 - 4*4

x = 4 - 4*4 / (6 - 5*4 )

x = 4 - 16 / ( 6 - 20 )

x = -12 / ( - 14 )

x = 12 /14

x = 2*2*3 / 2* 7

x = 2*3 / 7

z = 6 /7


4 posted on 01/09/2012 9:51:32 PM PST by Pikachu_Dad (Impeach Sen Quinn)
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To: FrogMom

That’s how I’d solve it.


5 posted on 01/09/2012 9:52:01 PM PST by FrogMom (There is no such thing as an honest democrat!)
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To: FrogMom

That weren’t so hard now, were it?


6 posted on 01/09/2012 9:52:29 PM PST by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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To: The SISU kid

Just a thought, but I am not getting that X answer, are you sure the info is correct?
I am mean years of college I have written down lots of problems transposing numbers.


7 posted on 01/09/2012 9:53:29 PM PST by svcw (For the new year: you better toughen up, if you are going to continue to be stupid.)
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To: The SISU kid

Dear Math,

I am not your therapist. Please solve your own problems.

Sincerely, Dave

( Couldn`t resist..Cheers)


8 posted on 01/09/2012 9:54:24 PM PST by NCDave (AKA, "That idiot over there")
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To: The SISU kid

4(4-5x)=6x+4

1) Distribute the 4:
16-20x=6x+4
2) Now solve for x:
-26x=-12

x = 6/13


9 posted on 01/09/2012 9:55:11 PM PST by Black_Shark
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To: The SISU kid

I think the answer might be incorrect.

4(4-5x)= 6x+4
16-20x=6x+4
16-4=6x+20x
12=26x
x=12/26=6/13


10 posted on 01/09/2012 9:55:33 PM PST by Jonty30 (What Islam and secularism have in common is that they are both death cults.)
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To: Pikachu_Dad

My bad. Sign error. Lets try that again.

4 [4 - 5x] = 6x + 4

Rearrange to get X on one side of the equation.

4*4 - 5*4*x = 6x + 4

-6x - 5*4*x = 4 - 4*4

(-6 - 5*4 ) x = 4 - 4*4

x = 4 - 4*4 / (-6 - 5*4 )

x = 4 - 16 / ( -6 - 20 )

x = -12 / ( - 26 )

x = 12 /26

x = 2*2*3 / 2* 13

x = 2*3 / 13

z = 6 /13


11 posted on 01/09/2012 9:56:19 PM PST by Pikachu_Dad (Impeach Sen Quinn)
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To: svcw

No I’m not... that was my problem as well...I’m dealing with a high school teacher who says she’s having difivulty explaining it to a student...(you get the idea)

My first response was that the answer was incorrect!

Thanks guys & gals, I knew you’ld come thru


12 posted on 01/09/2012 9:56:58 PM PST by The SISU kid (I feel really homesick all the time & so do all the other aliens.....)
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To: DuncanWaring; FrogMom

6/13 or .4615384615 is correct


13 posted on 01/09/2012 9:57:10 PM PST by DKM
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To: The SISU kid

4 [4 - 5x] = 6x + 4

16 - 20x = 6x + 4
-6x + 16 -20x = 6x - 6x + 4
-6x -20x +16 -16 = 6x -6x + 4 - 16
-26x = -12
x = -12/-26 = 6/13

Checked with http://www.wolframalpha.com/bing/?i=4(4+-+5x)+%3d+6x+%2b+4

says answer is x= 10/7


14 posted on 01/09/2012 9:58:20 PM PST by Ingtar (If the GOP wants my vote, they should start fielding candidate for whom I can vote - Jemian)
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To: The SISU kid
4 [4 - 5x] = 6x + 4
16 - 20x = 6x + 4
12 = 26x
12/26 = x
6/13 = x


6/13 does not equal 10/7

The answer supplied to you is wrong, very wrong.
15 posted on 01/09/2012 9:59:53 PM PST by aruanan
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To: The SISU kid

You can get x = 10/7 if you left of a negative sign on the first 4.

-4 [4 - 5x] = 6x + 4

-16 + 20x = 6x + 4

14x = 20

x = 20/14

x = 10/7


16 posted on 01/09/2012 10:00:11 PM PST by Pikachu_Dad (Impeach Sen Quinn)
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To: The SISU kid

3:16


17 posted on 01/09/2012 10:00:44 PM PST by ansel12 (Romney is unquestionably the weakest party front-runner in contemporary political history.)
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To: Ingtar

Who says the answer is x=10/7 because wolframalpha states x= 6/13.


18 posted on 01/09/2012 10:00:44 PM PST by Black_Shark
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To: DKM

Your decimal answer is incorrect, as 6/13 doesn’t end after just 10 decimal places. :)


19 posted on 01/09/2012 10:02:09 PM PST by Jonty30 (What Islam and secularism have in common is that they are both death cults.)
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To: The SISU kid

Don’t let a democrat solve it, it will end up costing you a trillion dollars to solve it.


20 posted on 01/09/2012 10:02:42 PM PST by ReformedBeckite (1 of 3 I'm only allowing my self each day)
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