# Need help rearranging formulae (GCSE)

I wasn't in my Maths lesson today, but I got given the homework anyways.

the question is

Make b the subject of the formula :   p= 2a + 2b

an explanation of how to get the answer would be very helpful - thanks in advance

Posted Mon 27th February, 2012 @ 17:15 by Ammy

p-2a=2b

p-2a/2=b

flip it around so it looks better

b=p-2a/2

You slowly, step by step take all of b's freinds away until it's by itself. So sad. When you move a number from one side of the = sign to another, plus becomes minus, minus becomes plus, divide becomes multiply, multiply becomes divde, square becomes square root and square root becomes square :)

I hope the explanation is good :)

Answered Mon 27th February, 2012 @ 19:11 by Meghna
Edited by Meghna on Mon 27th February, 2012 @ 19:11

You just have to rearrange it so that b equals the rest of it. So the answer is

b =  p-2a/2 ( in fraction form)

Answered Mon 27th February, 2012 @ 17:23 by Shannon Tennant-Smith - Team GR

thanks guys :-)

Answered Fri 2nd March, 2012 @ 20:13 by Ammy