You are Here: Home >< Maths

rearranging formulae higher tier maths watch

1. hi,

1. w=x²+y make x the subject of the formula

and
2. r-3=pi(t-2r) make r the subject of the formula

NOTE: pi represents the symbol

2. hi,
im doing some rearranging formulae and im stuck on two questions

1. 3x+2y=8y-3 make x the subject of the formula but simplify as much as possible.

2. u=t/3 +5 make t the subject of the formulae

thank you
3. no, you show your working! (and you posted this in the wrong section by the way).

have you done anything so far?
4. higher tier :s

i swear we did this sort of stuff in year 5 or 6.

and show us what you've done
5. Just think of the equals sign as a pair of scales that you have to keep balanced. Whatever you do to one side you have to do the same to the other to keep them balanced e.g. if you add/subtract 5 to one side, you must do the same to the other side.
6. (Original post by joshy123)
hi,
im doing some rearranging formulae and im stuck on two questions

1. 3x+2y=8y-3 make x the subject of the formula but simplify as much as possible.

2. u=t/3 +5 make t the subject of the formulae

thank you
x= 2y-1

t=3u-15
7. (Original post by joshy123)
hi,
im doing some rearranging formulae and im stuck on two questions

1. 3x+2y=8y-3 make x the subject of the formula but simplify as much as possible.

2. u=t/3 +5 make t the subject of the formulae

thank you
1. Begin by keeping the 3x on the Left hand side and taking 2y away from both sides
3x = 8y - 2y - 3
and then you can subtract the 2y from the 8y
3x = 6y - 3
and then you divide by 3 to get x on it's own as you want to make x the subject of the formula so you get
x = 2y - 1

2. First off all multiply by 3 to get t on its own so you get
3u = t + (3 x 5)
3u = t + 15
As you want to make t the subject then you take away 15 from both sides to get
3u - 15= t
8. (Original post by joshy123)
hi,

1. w=x²+y make x the subject of the formula

and
2. r-3=pi(t-2r) make r the subject of the formula

NOTE: pi represents the symbol

for question one you have to -y on both sides, so that is w-y=x²
then to get x yuh will have to square root w-y

Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 6, 2013
The home of Results and Clearing

2,227

people online now

1,567,000

students helped last year
Today on TSR

University open days

1. London Metropolitan University
Sat, 18 Aug '18
2. Edge Hill University
Sat, 18 Aug '18
3. Bournemouth University
Sat, 18 Aug '18
Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants