Suggested answers 1 2 3 4 5 6


Exercise 3 Guidelines on how to implement this activity


Compare the characteristics of direct and indirect proportion. Let the learners start with Exercise 3 in the class and discuss the answers with them once they have finished Questions 1 and 2. Work through Question 3 of Exercise 3 with participation of the learners since it requires some skill to draw the curve in the first quadrant. Compare the characteristics of direct and indirect proportion with reference to their respective graphs.


Suggested answers 1.1


1.2 1.3 2.1


xy = 30


Indirectly proportional as the product xy is constant. 8


Number of workers (n) Time taken in hours (t) Man-hours for the task


Construction. 30 240


12 20


240


20 12


240


2.2 nt = 240 2.3 Indirectly proportional as the product nt is constant. 3.1 3.2


Length of rectangle: l


24 10


240


30 8


240


Length of each piece (x) 1 m 1,5 m 2 m 3 m 5 m 6 m 7,5 m 10 m 15 m Number of pieces (y)


30 20 15 10 6 5 4 3 2


The table shows indirect proportion as xy = 30


The table shows neither direct nor indirect proportion. The table shows neither direct nor indirect proportion. The table shows indirect proportion as xy = 60 The table shows direct proportion as y = 5x The table shows direct proportion as y = − x


__ 5 .


Learner’s Book page 34


12 cm 10 cm 8 cm 6 cm 4 cm 3cm


2cm 1 cm


Breadth of rectangle: b 1 cm 1,2 cm 1,5 cm 2 cm 3 cm 4 cm 6 cm 12 cm Area of rectangle


12 cm² 12 cm² 12 cm² 12 cm² 12 cm² 12 cm² 12 cm² 12 cm²


42 Section 4: Teaching Mathematics


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