and solve the problem as you would with any similar problem. If you need help actually finding the tangent of a curve at a point I'll help with that :smile:

Reply 4

ryan-927

no it ok, I got it from there, just forgot to differentiate the y :smile:

, thanks anyway

Reply 5

ryan-927

although i am stuck on this one question, not to sure how to get it to differentiate
xy=25, at point (5,5) ?

Reply 6

Dj.Clay

Just rearrange to get it in the form y=something

xy=25

y=\frac{25}{x}=25x^{-1}

(edited 12 years ago)

Reply 7

ryan-927

oh right, thanks for that :smile:

Reply 8

f1mad

Or you could differentiate implicity using the product rule. And then -rearranging to get dy/dx= ...

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find the equation of the tangent to the curve

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