Direct and inverse proportion 2 Copyright © R F Barrow 2011, all rights reserved

Direct and inverse proportion

Solutions: Formula:

Do these figures show that y is directly proportional to the square root of x? y x 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.

Do these figures indicate that y is inversely proportional to the cube of x? y 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.

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