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Direct and inverse proportion 2 www.waldomaths.com Copyright © R F Barrow 2011, all rights reserved.

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Presentation on theme: "Direct and inverse proportion 2 www.waldomaths.com Copyright © R F Barrow 2011, all rights reserved."— Presentation transcript:

1 Direct and inverse proportion 2 www.waldomaths.com Copyright © R F Barrow 2011, all rights reserved

2 Direct and inverse proportion

3 Solutions: Formula:

4 Do these figures show that y is directly proportional to the square root of x? y426.32.1 x360.810.09 The value of k is the same each time, so the figures do indicate that y is directly proportional to the square root of x.

5

6 Do these figures indicate that y is inversely proportional to the cube of x? y5400.625 x10520 The value of k is the same each time, so the figures do indicate that y is inversely proportional to the cube of x.

7 A Waldomaths clip this, along with other videos and more than 100 applets, all on mathematical themes, can be found on the free website www.waldomaths.com Copyright © R F Barrow 2011, all rights reserved visit Waldomaths today

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