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ALGECFORMCHAPTER 7: F

3

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7.1

Concept of Variable

Constant

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LEARNING OBJECTIVE:

At the end of this subtopi students shoto:

i# dete$%ine if " &u"ntit' in " (i)en situ)"$i"b!e o$ " onst"nt#

ii# dete$%ine the )"$i"b!e in " (i)en situ$ep$esent it *ith " !ette$#

iii# dete$%ine the possib!e )"!ues of " )"(i)en situ"tion#

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Definition:

+ARIABLE : &u"ntities "$e not

CO./TA.T : &u"ntities "$e ,-

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Variable / Constant?SITUATION VARIABLE/ C

i0 The nu%be$ of hou$s in " d"'

ii0 The speed of " fo$%u!" one "$ in "Fo$%u!"

One R"eiii0 .u%be$ of students in " shoo! bus

e)e$'d"'

i)0 Tot"! nu%be$ of sides of " s&u"$e

)0 B!ood p$essu$e of footb"!! p!"'e$

)"$i"b

)"$i"b

)"$i"b

onst"

onst"

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Variable and letter?SITUATION VARIABLE

Hei(ht of e"h students in'ou$ !"ss

Hei(ht of student

.u%be$ of students p$esent

in 'ou$ !"ss e)e$' d"'

.u%be$ of students

.u%be$ of boo1s th"t 'oub$in( to shoo!

.u%be$ of boo1s

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7.2

Concept of Formu

to Solve Problem

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LEARNING OBJECTIVE:

At the end of this subtopi students sh"b!e to:

i# 2$ite " fo$%u!" b"sed on " (i)en

"0 /t"te%entb0 situ"tion

ii# Identif' the subet of " (i)en fo$%

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Definition

Fo$%u!" : "n e&u"tiononnet )"$i"b!e*ith "si(n#

6

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Write a formulaE-"%p!e 8

Const$ut fo$%u!" fo$ the pe$i%ete$9 p %9 of the $

" %

b %

Pe$i%ete$ 5 ""bb

5 ;" ;b

5 ;

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Subject of Formula

/ubetfo$%u!"

/in(!e!ine"$

)"$i"b!e

A 5 ;

Coe=ient subet

is 8A

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Change Subject of the Formula

E-"%p!e ;

Ch"n(e the subet of the fo!!o*in( fo$%u!"e to the !ette$ (i)en in b$"1

"0 b0 0

6

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