Monday

December 22, 2014

December 22, 2014

Posted by **Chris** on Monday, November 5, 2007 at 4:20pm.

I thought I knew how to do this, but my teacher said i was wrong. This what I thought:

(-9)-4w+7w=42

(-9)-11w=42

+11w +11w

(-9)=42+11w

-42 -42

(-9)-42

(-9)+(-42)

11w=(-51)

/11 /11

w= 4.636363636363......

She told us that the correct answer is 17, but I could not find any way 17 could be the answer. Please help me with this and show me the correct way to do this.

Thank you so much.

- Math- Corrections -
**DrBob222**, Monday, November 5, 2007 at 4:27pm(-9)-4w+7w=42

(-9)-11w=42**-4w+7w = +3w. You don't change the sign of the 7w unless you move it to the other side.**

+11w +11w

(-9)=42+11w

-42 -42

(-9)-42

(-9)+(-42)

11w=(-51)

/11 /11

w= 4.636363636363......**The answer is, indeed, 17.**

- Math- Corrections -
**Chris**, Monday, November 5, 2007 at 4:41pm(-9)-4w+7w=42

(-9)-(-4)+7w=42

(-9)-3w=42

+3w +3w

(-9)=42+3w

-42 -42

(-9)-42

(-9)+(-42)

3w= -51

/3w /3w

w= -17

I got -17. How is this possible?

- Math- Corrections -
**DrBob222**, Monday, November 5, 2007 at 4:45pmRe-read my first response.

-4w+7w=**+3w**and not -3w.

- Math- Corrections -
- Math- Corrections -
**Chris**, Monday, November 5, 2007 at 4:50pmI know that it was positive. I wrote a minus sign, not a negative sign. What do I have to do.

P.S- Sorry, but I really want to get it right.

- Math- Corrections -
**DrBob222**, Monday, November 5, 2007 at 5:02pm**No, you wrote a -3w where I have placed the asterisks. You made another error also, You placed a - sign in front of a -4. You should not have done that.I have placed a # mark there.**

(-9)-4w+7w=42

(-9)-**##**(-4)+7w=42

(-9)-3w*******=42

+3w +3w

(-9)=42+3w

-42 -42

(-9)-42

(-9)+(-42)

(-9)-4w+7w=42

-9+3w=42

-9+9+3w=42+9

3w=51

3w/3 = 51/3

w=17

3w= -51

/3w /3w

w= -17

- Math- Corrections -
**Chris**, Monday, November 5, 2007 at 5:12pmOh, okay I understand now.

Thank you. I did the correct work.

**Answer this Question**

**Related Questions**

mat 117/algebra - 2/(5w+10 )- 3/(2w-4) please show me how to work this problem. ...

MATH - How would i do 11w-9-7w=15 ?

Algebra - w^2-11w+30=0

algebra - How do you factor 2w^2+11w-30 ???

algebra - 10 a. 7m + 36 =11m b. 2x+ 4=10x-4 c.11w-8=22-w d.6a - 12-a = 9a +53+a

Pre Alegebra - Simplify: 10w - 11w + 4W + (-5W)

Algebra 1 - Simplify the following rational expression: 6w^2 + 11w - 7/6w - 3

Math - I need help with these please: 4. Simplify sqrt27/75. The answer should ...

basic geometry - The length of a rectangular picture is seven iches longer than ...

math,correction - Geometry. Find the perimeter of the given figure. tHE Figure ...