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 Calculus Help!
 FlyVirgin744 From United States of America, joined Jul 1999, 1313 posts, RR: 1Posted Fri Oct 12 2001 04:18:28 UTC (14 years 7 months 3 weeks 2 days 8 hours ago) and read 5320 times:

 Alright all you smart people: Regarding related rates, Assume x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt . Equation: xy = 4 Find: dy/dt when x = 8 Given: dx/dt = 10 and Find: dx/dt when x = 1 Given: dy/dt = -6 Please someone shed some light! Matt
 Sometimes I go about in pity for myself and all the while a great wind carries me across the sky.
 PanAm747 From United States of America, joined Feb 2004, 4242 posts, RR: 8 Reply 1, posted Fri Oct 12 2001 04:40:19 UTC (14 years 7 months 3 weeks 2 days 7 hours ago) and read 5315 times:

 you have to use the multiplication rule: xy'+yx'=4 I think, it's been a while.
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 FlyVirgin744 From United States of America, joined Jul 1999, 1313 posts, RR: 1 Reply 2, posted Fri Oct 12 2001 04:51:53 UTC (14 years 7 months 3 weeks 2 days 7 hours ago) and read 5312 times:

 Panam, that rule does come into play but it gets quite a bit more complicated. Thank you for your response though.
 Sometimes I go about in pity for myself and all the while a great wind carries me across the sky.
 Pgh234 From United States of America, joined Jul 2001, 820 posts, RR: 1 Reply 3, posted Fri Oct 12 2001 05:22:15 UTC (14 years 7 months 3 weeks 2 days 6 hours ago) and read 5310 times:

 OMG, that is SOOOOOO creepy. I am doing the EXACT SAME PROBLEM for my AP Calculus homework as I am reading your post. Do you happen to have the same book as me also? It is a red Calculus book with "Larson-Hostetler-Edwards" Second edition on the bottom of the cover and the problem you are refering to is on Page 178, problem #3a in section 2.7? anyways, to solve: xy = 4 dx/dt=10 and find dy/dt when X=8 (x dy/dt + y dx/dt) = 0 (Multiplication Rule as stated above) dy/dt = -(y/x)dx/dt dy/dt = - ((1/2)/8) * 10 (Found Y value by solving equation for X=8) dy/dt = -5/8 Good Luck in Calculus, cuz so far, it sucks! pgh234
 FlyVirgin744 From United States of America, joined Jul 1999, 1313 posts, RR: 1 Reply 4, posted Fri Oct 12 2001 05:30:54 UTC (14 years 7 months 3 weeks 2 days 6 hours ago) and read 5307 times:

 Thank you so much! Seems so easy now   I am actually using the 6th edition of your book! Its brand new, could have some better examples though. Well thanx again and good luck to you also in your class. And oh yes, it definetely does suck.
 Sometimes I go about in pity for myself and all the while a great wind carries me across the sky.
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