Inverse proportion Watch

Steve445
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I know how to do it, its just that I can't approach it and it's really annoying me! Please help...
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Steve445
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RDKGames
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(Original post by Steve445)
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You scribbled out the correct approach!

If y is inversely proportional to 2x^3 then y = \dfrac{k}{2x^3}.

So you have an equation.

Use the fact that y = 20 when x=a to determine the value of k in terms of a.
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Steve445
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20=y/2x^3
20=y/8x

20 ÷ 8 is 2.5

When X 2a you do 2 ÷ 8 = 4 ?
Last edited by Steve445; 1 week ago
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