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

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

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 -
**Chris**, Monday, November 5, 2007 at 4:50pm
I 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 5:12pm
Oh, okay I understand now.

Thank you. I did the correct work.

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