rearranging formulae higher tier maths

hi,
i need some help on rearranging formulae. could someone please help.

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

please could you show your working out

NOTE: pi represents the symbol

:smile:

Reply 1

joshy123

OP

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

please could you show your working :smile:

thank you

Reply 2

refref

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

have you done anything so far?

Reply 3

didgeridoo12uk

16

higher tier :s

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

and show us what you've done

Reply 4

TheNack

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.

Reply 5

Ben77mc

14

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

please could you show your working :smile:

thank you

x= 2y-1

t=3u-15

Reply 6

Staring into space

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

please could you show your working :smile:

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

Reply 7

S96

Original post by joshy123

hi,
i need some help on rearranging formulae. could someone please help.

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

please could you show your working out

NOTE: pi represents the symbol

:smile:

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

rearranging formulae higher tier maths

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