Posted by **Musa** on Sunday, November 3, 2013 at 6:02pm.

x and y vary inversely, and y = 3 when x = 6. Find y when x = 9.

A. 2

B. 4.5

C. 12

D. 18

- Alegrbra 1 -
**Reiny**, Sunday, November 3, 2013 at 7:51pm
if x and y vary inversely, then

y = kx, where k is a constant

using the given data

3 = k(6)

k = 1/2

so y = x/2

when x = 9, then y = 9/2 or 4.5

or

use an inverse ratio

x1/y1 = x2/y2

6/3 = 9/y

6y = 27

y = 27/6 = 9/2 = 4.5

9y =

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