My Math Forum Can someone correct these exercises on transforming equations?

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

October 4th, 2017, 12:50 PM   #1
Newbie

Joined: Mar 2017
From: leuven

Posts: 20
Thanks: 0

Can someone correct these exercises on transforming equations?

So I noticed that I'm horrible at something as basic as transforming formulas. I realized that I just never really got any real basis for this. I just always did what felt right, which is really not ideal in math.

So to get this out of the way, I decided to try some exercises on this.

I learn a lot by seeing where I go wrong, as I am often not sure whether I'm allowed to do something. So for me seeing a correction can confirm for me what the actual rules are.

So I'm hoping that anyone here could be so kind as to correct some of these. It would really help me out a lot. I do realize that some of the answers I give must seem really dumb. So, just as a disclaimer, I have a really weak background in math but do enjoy it and really want to completely understand basic things like this so I don't mess up in bigger exercises, which right now is my main reason for failing to solve more complex problems.

Anyway, if anyone could take a look I would be really thankful for that!

These are only a few exercises. However, I want to confirm some doubts I have about certain rules before I make the same mistake 20 more times.
Attached Images
 transforming.jpg (20.5 KB, 11 views)

Last edited by skipjack; October 4th, 2017 at 06:18 PM.

 October 4th, 2017, 05:29 PM #2 Global Moderator   Joined: May 2007 Posts: 6,628 Thanks: 622 1,2,4,6 look ok. 3. Set 2A= and proceed. 5. Where is r? 7. Multiply through by 5/9.
 October 4th, 2017, 06:36 PM #3 Global Moderator   Joined: Dec 2006 Posts: 19,870 Thanks: 1833 5. The crossed out expression is okay.
 October 9th, 2017, 04:51 AM #4 Newbie   Joined: Mar 2017 From: leuven Posts: 20 Thanks: 0 Ah thank you guys. I'll definitely take a look at the wrong ones again and try to learn a bit from it. Sorry for taking so long to respond. Last edited by skipjack; October 9th, 2017 at 04:58 AM.

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