Algebra

Bytheendofthelessonyoushouldbeableto:

Changethesubjectofaformula.

Theformulafortheperimeterofacircleis:

ThesubjectofthisformulaisP.

Wecanrearrangeaformulatochangeitssubject.Forexampleifweneedtocalculated,wecanmakedthesubjectoftheformula:

Makexthesubject:

x5=a+b

Makeathesubjectoftheformula:

4a+5b=20

ThecostofhiringataxifromtheairportisgivenbyC=5+0.75m,whereCisthecostindollarsandmisthenumberofkilometresdriven.

Makemthesubjectoftheformula.

Tomhiredataxifromtheairporttohishouse.Thecostwas$33.HowfardoesTomlivefromtheairport?Giveyouranswerto1d.p.

Makesthesubjectofthisformula:

Theformulaforthevolumeofaconeis

Makehthesubjectoftheformula:

Makexthesubjectoftheformula:

Arebothanswerscorrect?Justifyyouranswer

Makexthesubjectoftheformula:

Makexthesubjectoftheformula:

SolvefromBookpage:118119

EVCHANGEOFSUBJECT.pdf

Y9 CHANGE OF SUBJECT EV

Level 1

For each of the following formulae, make the letter in brackets the subject.

4 + 5 = 20 () 4 + 5 = 20 ()

3 + 5

= 8 ()

3 + 5

= 8 ()

5 2

= ()

5 2

= ()

5 2

= ()

Level 2

Make x the subject of these formulae:

a) y x a

tz

b) 2k m x

aa

c)V

Dx t

d) b

tc x

e)r

qx m

MN

x q

SMART Notebook

Attachments

2009CHANGEOFSUBJECT.docx

EVCHANGEOFSUBJECT.pdf

Y9 CHANGE OF SUBJECT EV

Level 1

For each of the following formulae, make the letter in brackets the subject.

Level 2

Make x the subject of these formulae:

SMART Notebook

Y9 CHANGE OF SUBJECT EV

Level 1

For each of the following formulae, make the letter in brackets the subject.

4 + 5 = 20 () 4 + 5 = 20 ()

3 + 5

= 8 ()

3 + 5

= 8 ()

5 2

= ()

5 2

= ()

5 2

= ()

Level 2

Make x the subject of these formulae:

a) y x a

tz

b) 2k m x

aa

c)V

Dx t

d) b

tc x

e)r

qx m

MN

x q

SMART Notebook

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