kammy

Hi,
Doing a bit of work involving some maths and struggling on some simple rearranging;
Need to re-arrange the following formula to make P the subject of the formula;

Q=1000-30p.

When I rearrange it I do the following:
Q-1000=-30p
Q-1000/-30=p
(Q /-30)- 33.33=p

However, the book I am learning from gets
P= 33.33- 0.033Q

Huh? Where did the -0.033 come from? I can do the rest of the question but a little, ok highly, confused on this little bit.

Prove your mental ability and help me at the same time-it wil be a good day for the successful one!
Kam

Crazy Chick

1 + 1 = 2

That's as much as I can do sorry.

Kev_turbo

swap over the p and the q so. Can also be seen as take Q from both sides and add 30P to both sides

30P = 1000 - Q

Divide all bits by 30

(30P / 30) = (1000 / 30) - (Q / 30)

solve all bits in brackets

P = 33.33333 - 0.033Q

farmer1

what he said

kammy

Well done my good friend, thats excellent and fast work. You have impressed me atleast.
Thanks again!

Kev_turbo

that is the first time in 10 years I have actually realised that maths and further maths A level might have been useful. Roll on 2015 when i use it again

jonnyrex

I was at the dentist the day we did that ...sorry

Hanslow

Where you were going wrong was dividing your -1000 by -30. It looks like you disregarded one of the minus signs in this part of the calculation, otherwise your working out looks correct