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C4 Implicit Differentiation

Can someone give me a pointer for a)ii) ? My answer is obviously wrong, and think a)i) is too, but not sure where I've gone wrong.

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Reply 1

ghostwalker

Original post by boods8897

...

a)i) is fine.

a)ii) is fine so far. You just need to eliminate "y", so sub back in to your original equation.

Reply 2

boods8897

Original post by ghostwalker

a)i) is fine.

a)ii) is fine so far. You just need to eliminate "y", so sub back in to your original equation.

Oh thankyou! That was annoyingly simple. .. I'd just been looking at the question in the wrong way.

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