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Vanity: Are you smarter than a 7th grader? (Need help with my kid's algebra homework)

Posted on 01/18/2012 6:08:38 PM PST by Maceman

The problem is:

3-4x = 6X+13

Can someone (please) demonstrate how to solve this? (I always was terrible at math).

Thanks.

KEYWORDS: algebra; homework; math; vanity
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1 posted on 01/18/2012 6:08:42 PM PST by Maceman

To: Maceman
X=-1

3=10x+13

Subtract 13 from both sides

-10=10x

Divide by 10: -1=x

2 posted on 01/18/2012 6:10:24 PM PST by ShadowAce (Linux -- The Ultimate Windows Service Pack)

To: Maceman

Negative ONE is the loneliest...

3 posted on 01/18/2012 6:10:59 PM PST by TFine80

To: Maceman

Easy peasy...balance the equation.

Get all the x’s on onside, all the whole’s on the other and then divide to find x.

sorry no answer from me...do the homework.

4 posted on 01/18/2012 6:11:13 PM PST by EBH (God Humbles Nations, Leaders, and Peoples before He uses them for His Purpose)

To: Maceman

3 - 4x = 6X + 13

3-4x (+4x) = 6X+13 (+4x)

3 = 10x + 13

3 (-13) = 10x + 13 (-13)

-10 = 10x

-10/10 = x

-1=x

5 posted on 01/18/2012 6:13:14 PM PST by Pan_Yan

To: Maceman

3-4x = 6X+13
+4x = +4x
____________
3 = 10x +13
-13 = -13
____________
-10 = 10x
Divide by 10
____________
1- = x

6 posted on 01/18/2012 6:13:59 PM PST by Jeff Chandler (Quando Omni Flunkus Moritati)

To: Maceman

3-4x = 6X+13
+4x = +4x
____________
3 = 10x +13
-13 = -13
____________
-10 = 10x
Divide by 10
____________
-1 = x

7 posted on 01/18/2012 6:14:26 PM PST by Jeff Chandler (Quando Omni Flunkus Moritati)

To: Maceman

WTF?? Get off FR and go to wolframalpha.com.

8 posted on 01/18/2012 6:14:42 PM PST by indianrightwinger

After solving ( X = -1), then put it into the original equation to check your work.

3 - 4x = 6x + 13
3 - 4*-1 = 6*-1 + 13
3 +4 = -6 + 13
7 = 7

9 posted on 01/18/2012 6:16:51 PM PST by mason-dixon (As Mason said to Dixon, you have to draw the line somewhere.)

To: Maceman
Check out Khan Academy. He has all the answers...and your kid will be an A student ASAP!
10 posted on 01/18/2012 6:17:02 PM PST by RoosterRedux (Newt: "Why vote for the guy who lost to the guy who lost to Obama?")

To: Maceman

Algebra solver- solves and explains your problem

http://quickmath.com/webMathematica3/quickmath/page.jsp?s1=equations&s2=solve&s3=basic

11 posted on 01/18/2012 6:17:18 PM PST by patriot08 (TEXAS GAL- born and bred and proud of it!)

To: Maceman

X= -1

12 posted on 01/18/2012 6:17:49 PM PST by SeaHawkFan

To: SeaHawkFan

bfl

13 posted on 01/18/2012 6:20:21 PM PST by Oshkalaboomboom

To: indianrightwinger

14 posted on 01/18/2012 6:20:38 PM PST by Nifster

To: Maceman

http://www.webmath.com

This is a website that we always use. It solves the problem, but also shows how to get the answer.

15 posted on 01/18/2012 6:24:01 PM PST by silly.kerry.trix.are.for.kids

To: Maceman

16 posted on 01/18/2012 6:28:27 PM PST by Drango (A liberal's compassion is limited only by the size of someone else's wallet.)

To: Maceman
17 posted on 01/18/2012 6:34:40 PM PST by US Navy Vet (Go Packers! Go Rockies! Go Boston Bruins! See, I'm "Diverse"!)

Boop His Tiny Tail!

Before He Turns Into an Enormous Fire-Breathing Monster

For each new monthly sign-up

18 posted on 01/18/2012 6:36:25 PM PST by TheOldLady (FReepmail me to get ON or OFF the ZOT LIGHTNING ping list)

To: Drango

You are correct.

19 posted on 01/18/2012 6:38:24 PM PST by AceMineral (Some people are too stupid for their own good.)

To: Maceman
```#!/usr/bin/perl

\$x= -101;
while (\$x < 101){
\$a= 3-(4*\$x);
\$b= (6*\$x)+13;
if (\$a == \$b){ print "\$x\n";}
\$x++;
}```

I'm a big believer in brute force. ;)

/johnny

20 posted on 01/18/2012 6:39:15 PM PST by JRandomFreeper (Gone Galt)