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ALGEBRAIC FORMULAE

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rL 2heightbreathLengthV

heightlenght2

1

)32(9

5 FC

Area of triangle=

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A = ½ x b x h

Subject of the formula

h

b

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Change the subject of the following formulae to the letter given in the brackets:Example 1:

27qp

pq 27

)(q

q p

27

Example 2:

yxw 5

wyx 5

)(x

x w

y5

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2

Example 3:

qp 2 )(q

q2 p

Example 4:

q p

2

nm 23 )(n

n2 m3

n m3

Thursday, April 13, 2023

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Thursday, April 13, 2023

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2

Example 5:

272 qp

pq 272

)(q

q2 p

27

Example 6: yxw 54

wyx 54

)(x

x4 w

y5

q27

p x

4

5yw

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2

Example 7: 272 2 qp

pq 272 2

)(q

22q p

27

Example 8:

yxw 53

wyx 53

)(x

3 x w

y5

2q 27p

x 35yw

q2

27

p

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Exercise

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Exercise

1. Make k the subject of the following formulae

34k

m a.

b.

c.

d.

92 kx

pk 26

54 hkk

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ExercisePage 161Ex.7.2CNo. 1a,b,c,d,e,f,I,j,k

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ALGEBRAIC FORMULAE(Find the value of variable)

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Given that , find the value of V when s=6 and h=9

Example 1: 21

3V s h

21

3V s h

1

3V

136 9

3V

Solution:

6 9

2

X X

1 36 3V 108V

1

3

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Given that , find the value of A when b=12 and h=4

Example 2:

1

2A bh

1

2A bh

1

2A

112 4

2A

Solution:

12

4

X X

1 12 2A 24A

1

2

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Exercise:

1. Given that , find the value of I when P=2500, R=8 and T=2

2. Given that , find the value of M when a=72 and b=28

3. Given that , find the value of A when h=15, a=13 and b=21

4. Given that , find the value of y when m= -2 ,x=5 and c= -4

5. Given that , find the value of L when x= -3 and t = 4

100

PRTI

4 3M a b

1( )

2A h a b

y mx c

2 2L x tx

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Exercise:

Pg.163

Ex.7.2E

No. 1 - 4

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Exercise:

Pg.167

Subjective Questions

No. 1 - 8