Posted by **tuhituhi** on Tuesday, January 29, 2013 at 7:46am.

if x and y vary inversely and x=18 when y=8,find x when y=16

- maths -
**Reiny**, Tuesday, January 29, 2013 at 7:55am
x and y vary inversely ---y = kx , where k is a constant

given: x=18, y = 8

8 = 18k

k = 4/9

so y = (4/9)x or 9x = 4y

when y = 16

9x = 4(16)

x = 64/9

or

x1/y1 = y2/x2

18/8 = 16/x2

18x2 = 8(16)

x2 = 8(16)/18 = 64/9

- maths -
**Steve**, Tuesday, January 29, 2013 at 10:34am
eh? inversely ==> xy = k

8*18 = k

k = 144

when y=16,

x*16 = 144

x = 9

## Answer this Question

## Related Questions

- Alegrbra 1 - x and y vary inversely, and y = 3 when x = 6. Find y when x = 9. A...
- Algebra 2 - On some tubes of caulking, the diameter of the circular nozzle ...
- math - Suppose that x and y vary inversely and that y=1/6 when x = 3. Write a ...
- Inverse Variation - Help me please.. Explain also :( 1. E is inversely ...
- Science - What is the relationship between the number of gas particles and ...
- Alg 2 HELP!! - 1.) Find an exponential function of the form y=ab^x whose graph ...
- Pre-Algebra - If y varies directly with x, find the constant of variation with x...
- maths - can you explain to me how to do this question i know i have to use ...
- maths, variations checking! - question: given that y is inversely proportional ...
- Maths - Suppose that y varies inversely with x and that y = 2 when x = 8. What ...

More Related Questions