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hiramobyBest ResponseYou've already chosen the best response.0
the answers are in the screen shot
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
dy/dt xy = 9 dy/dt xy = 9 xy' = 9 y' = 9/7
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
dx/dt xy =  9 yx' =  9 y(7) =  9 y =9/7 y = 9/7
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
I think this is right just using implicit differentiation
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
and chain rule
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
do you understand how I got my answer?
 one year ago

hiramobyBest ResponseYou've already chosen the best response.0
Thank you, help me with my other question please. Yes I did , i was stuck after implicit.. thought it could not be this easy
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
ok send me a link to your next question
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
@Australopithecus I'm confused by what you did in your steps. When you took the derivative, did you remember to apply the product rule? :o
 one year ago

hiramobyBest ResponseYou've already chosen the best response.0
austra i sent you a mail
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
I dont need to apply the product rule because we are taking the derivative in respect to t not in respect to y or x so they are treated as constants
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
No both are variables, unless you're taking a partial derivative, you need to apply the product rule.
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.2
both are functions of time.
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
I did the steps using the product rule and I also came up with 9/7... so maybe just a little bit of luck XD lol
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
oh I guess so :)
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.2
d/dt( x*y=9) = dx/dt*y + x*dy/dt =0 dy/dt = dx/dt *y/x
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
can you break down the steps clearer algebraic!
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.2
it's just use of the product rule on x*y =9 then solving algebraically for dy/dt
 one year ago

zepdrixBest ResponseYou've already chosen the best response.1
dw:1351050464937:dw Leibniz notation (with the differentials) can be a little tricky to understand. Maybe if you see it with the primes it'll make some sense :o
 one year ago

AustralopithecusBest ResponseYou've already chosen the best response.1
yeah that makes a lot more sense seeing as I had to take the derivative on both sides of the equation and I kept getting 0 Thanks for the refresher
 one year ago

Algebraic!Best ResponseYou've already chosen the best response.2
you do take the derivative on both sides and you do 'get 0'
 one year ago
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