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

[Maceman]

The problem is:

3-4x = 6X+13

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

Thanks.

[ShadowAce]

X=-1

Add 4x to both sides:

3=10x+13

Subtract 13 from both sides

-10=10x

Divide by 10: -1=x

[TFine80]

Negative ONE is the loneliest...

[EBH]

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.

[Pan_Yan]

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

[Jeff Chandler]

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

[Jeff Chandler]

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

[indianrightwinger]

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

[mason-dixon]

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

[RoosterRedux]

Check out Khan Academy. He has all the answers...and your kid will be an A student ASAP!

[patriot08]

Algebra solver- solves and explains your problem

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

[SeaHawkFan]

X= -1

Did it in my head in about 3 seconds.

[Oshkalaboomboom]

bfl

[Nifster]

good advice about a great web site

[silly.kerry.trix.are.for.kids]

http://www.webmath.com

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

[Drango]

[US Navy Vet]

http://www.purplemath.com/modules/index.htm

[TheOldLady]

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[AceMineral]

You are correct.

[JRandomFreeper]

#!/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