1.4 Which of the sets of numbers below satisfies the rule above? List all the sets that satisfy the relationship. 1.4.1 x = 0 and y = 2


1.4.3 x = −1 and y = −1 1 1.4.6 x = −10 and y = −3


__ 2


1.4.2 x = −1 and y = 1 1 1.4.4 x = −1 and y = 2 1 1.4.6 x = −10 and y = 7


__ 2


2 Paul has a bag of plastic triangles. Each triangle is an equilateral triangle with sides of 2,5 cm. He packs them in rows, so that each group of rows forms another triangle as shown below:


__ 2


Term 1


Term 2


2.1 Copy and complete the table below: Shape number (s)


Number of plastic triangles (t) Perimeter of shape (p) (cm)


1 1


7,5


Term 3


2 4


15


2.2 What do you notice about the pattern of the numbers in the middle row? 2.3 Which of the following equations describes the relationship between s and t? If more than one equation applies, say so. 2.3.1 t = 2s 2.3.4 s = t


2.4 Which of the following equations describes the relationship between s and p? If more than one equation applies, say so.


__ 2


2.4.1 p = s + 7,5 2.4.3 p = 7,5s


2.4.2 s = p 2.4.4


___ 7,5


p = 7s + 0,5


2.5 What is the perimeter of a shape made up of: 2.5.1 100 triangles


2.6.2 750 cm 2.5.2 144 triangles 2.5.3 256 triangles?


2.6 How many triangles will there be in a shape that has a perimeter of: 2.6.1 75 cm


2.6.3 75 m?


2.3.2 s = t2 2.3.5 s = √


__ t


2.3.3 t = s2


3


4


5


6


Unit 4: Equivalent forms


135


CHAPTER 4


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