#2**+11 **

Your goal is to get x all alone.

Even i had trouble and still do with these equations, but every time you get rid of something you have to think of the consequences that's why you should take away the small things so that the equations is closer to x and its less complicated.

In the coding, i have shown what i added or took away.

Look at that and speak to me after if you're still having trouble answering it.

When i added 9x if instead +2x i would have gotten a negative but it's still right and i still would have gotten an answer.

$$\begin{array}{rrl}

33-2x&=&5-9x\qquad(- 5)\\

28-2x&=&-9x\qquad(+2x)\\

28&=&-7x\qquad(28\div(-7)=-4)\\

x&=&-4\\

\end{array}$$

Also correct!

MathsGod1
May 16, 2015

#1**+11 **

$$\begin{array}{rrlll}33-2x&=&5-9x\qquad&(- 5)\\

28-2x&=&-9x\qquad&(+9x)\\

28+7x&=&0\qquad&(which\;means)\\

28&=&-7x\qquad&(28\div-7=4)\\

x&=&-4\\

\end{array}$$

MathsGod1
May 16, 2015

#2**+11 **

Best Answer

Your goal is to get x all alone.

Even i had trouble and still do with these equations, but every time you get rid of something you have to think of the consequences that's why you should take away the small things so that the equations is closer to x and its less complicated.

In the coding, i have shown what i added or took away.

Look at that and speak to me after if you're still having trouble answering it.

When i added 9x if instead +2x i would have gotten a negative but it's still right and i still would have gotten an answer.

$$\begin{array}{rrl}

33-2x&=&5-9x\qquad(- 5)\\

28-2x&=&-9x\qquad(+2x)\\

28&=&-7x\qquad(28\div(-7)=-4)\\

x&=&-4\\

\end{array}$$

Also correct!

MathsGod1
May 16, 2015

#3**+5 **

Hi MG

Your understanding of equations and your LaTex presentations are coming along brilliantly.

All the adults on the forum a are very pleased that you are learning here with us!

Your first post here was incorrect (you did not add 9x correctly) and you have redone it so you should delete your first post so it will not be confusing.

Better comments for the correct post would have been

(-5 from both sides)

(+2x to both sides)

(divide both sides by -7)

Melody
May 16, 2015

#4**+5 **

Thanks Melody, but why was it wrong to + 9x

How did you know that it was wrong and you had to add 2x?

MathsGod1
May 16, 2015

#6**+5 **

I know that Alan, but i just skipped it or is that part vital for the equation?

MathsGod1
May 16, 2015

#7**+5 **

In that case, in your first answer you got a sign wrong when you skipped it!

28+ 7x = 0 isn't the same as 28 = 7x, it's the same as 28 = -7x

.

Alan
May 16, 2015

#10**+5 **

Huh I'm not sure whether you mean negative 7x as its placed there or the operation sign minus?

MathsGod1
May 16, 2015