# Alegrbra 1

posted by .

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 -

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 =

## Similar Questions

1. ### math

Suppose that x and y vary inversely and that y=1/6 when x = 3. Write a function that models the inverse variation and find y when x = 10.
2. ### Inverse Variation

Help me please.. Explain also :( 1. E is inversely proportional to Z and Z = 4 when E = 6. 2. P varies inversely as Q and Q = 2/3 when P = 1/2. 3.R is inversely proportional to the square of I and I = 25 when R = 100. 4. F varies inversely …
3. ### Algebra 2

On some tubes of caulking, the diameter of the circular nozzle opening can be adjusted to produce lines of varying thickness. The table shows the length (L) of caulking obtained from a tube when the nozzle opening has diameter (d) …
4. ### maths

if x and y vary inversely and x=18 when y=8,find x when y=16
5. ### Science

What is the relationship between the number of gas particles and pressure. Are these two variables directly proportional or do they vary inversely?
6. ### Pre-Algebra

If y varies directly with x, find the constant of variation with x = 4 and y = -24 If y varies inversely with x, find the constant of variation with x=5 and y = 10 If y varies directly with x, and y = 35 when x = 5 , find x when y …
7. ### Alg 2 HELP!!

1.) Find an exponential function of the form y=ab^x whose graph passes through the points (2,48) and (5,3072) 2.) The variables x and y vary inversely. Use the given values to write an equation relating x and y. Then find y when x=3. …
8. ### Math/Algebra

Im stuck on two problems and would really appreciate the help. 1. y varies jointly as a and b, and inversely as the square root of c. y=28 when a=2, b=7, and c=9. Find y when a=4, b=2, and c=4 2. y varies directly as x and inversely …
9. ### math

The variables x and y vary inversely. When y is 24, x is 8. What is y when x is 4?
10. ### Algebra2

suppose c and d vary inversely and d=2 when c=17 write an equation that models that variation find d when c=68

More Similar Questions