Posted by Chris on .
(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,
(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,
(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,
Reread my first response.
4w+7w= +3w and not 3w. 
Math Corrections 
Chris,
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,
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,
Oh, okay I understand now.
Thank you. I did the correct work.