Saturday

August 2, 2014

August 2, 2014

Posted by **SYAZ** on Sunday, May 5, 2013 at 8:42am.

- MATH -
**Reiny**, Sunday, May 5, 2013 at 10:09amSo we have

1/x + 1/y = 1/5

differentiate with respect to t

(-1/x^2)dx/dt + (-1/y^2)dy/dt = 0

(-1/x2)dx/dt = (1/y^2)dy/dt

dx/dt = (-x^2/y^2)(dy/dt)

given:

when y = 9

1/x + 1/9 = 1/5

1/x = 4/45

x = 45/4

and dy/dt = ???? , not clear what you mean by

16 CM^(-1)

what ever it is, sub into

dx/dt = (-(45/4)^2 /81) (????)

= (-25/16)(????)

**Related Questions**

physics - Question: 15 of 30: The distance versus time plot for a particular ...

math (distance problem) - The points A, B, C, D, and E are located on a straight...

physics - Two speakers are driven by a common oscillator at 870 Hz and face each...

math - Two radar stations at A and B, with B 6 km east of A, are tracking a ship...

Physics - I'm writing a prac report, and I just need something clarified. The ...

Physics - I'm writing a prac report, and I just need something clarified. The ...

physics help please - Two speakers are driven by a common oscillator at 870 Hz ...

Calculus - A plane flying with a constant speed of 14 km/min passes over a ...

calculas - A plane flying with a constant speed of 19 km/min passes over a ...

math - The points A, B, C, D, & E are located on a straight line, in order, in ...