Formula RearrangementBackground Knowledge

By the end of this lesson you will be able to explain/solve the following:1. The Subject of an equation2. Rearrange a given formula

Formula RearrangementIn the formula D = xt + p we say that D is

the subject. This is because D is expressed in terms of

the other variables x, t and p.We can rearrange the formula to make one

of the other variables the subject. We do this using the usual rules for solving

equations. Whatever we do to one side of the equation

we must also do to the other side.

Worked Example 18

Exercise I

Worked Example 19

Exercise I

Worked Example 20

Exercise I

Exercise I

Exercise I

fu

ufv

fufuv

fufvuv

fvfuuv

fuvv

fuv

u

fuv

f

fuv

vuf

)(

simplify

)by sidesboth multiply (=

11=

1