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 June 1st, 2014, 08:35 AM #1 Newbie   Joined: Jun 2014 From: UK Posts: 14 Thanks: 0 basic rearrange Apparently 2y+4=x-3 can be rearranged to x-2y-7=0 If you deduct 2y from both sides of 2y+4=x-3 you get 4=x-3-2y, but I thought if you added 4 the -3 on the right would change to +1. Evidently the operator is disregarded and 4 is added to the 3 on the right. Sure this is pretty basic, but it's been a long time since I studied this. cheers Mark Last edited by skipjack; June 1st, 2014 at 11:02 AM.
 June 1st, 2014, 10:42 AM #2 Senior Member     Joined: Jul 2012 From: DFW Area Posts: 642 Thanks: 99 Math Focus: Electrical Engineering Applications Hi markcr, You need to deduct 4 from each side, not add: \displaystyle \large \begin{align} 2y +4 &= x-3 \\ 2y+4-2y &= x-3-2y \\ \\ 4 &= x-3-2y \\ 4-4 &= x-3-2y-4 \\ \\ 0 &= x-2y-7 \\ \end{align} Thanks from markcr
 June 1st, 2014, 01:07 PM #3 Newbie   Joined: Jun 2014 From: UK Posts: 14 Thanks: 0 thanks! I have a feeling this forum is going to be a great help with my endeavours... Mark
June 1st, 2014, 01:55 PM   #4
Senior Member

Joined: Jul 2012
From: DFW Area

Posts: 642
Thanks: 99

Math Focus: Electrical Engineering Applications
Quote:
 I have a feeling this forum is going to be a great help with my endeavours...
I hope so too. Usually I notice when a new member makes their first post and I say "welcome to the forums".

For some reason, I failed to do so this time, so:

welcome to the forums!

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