Question

Graphs of rational functions help! will medal 2 questions

Answer 1

need help with these questions! can you help me?

1. Write a specific formula to describe the variation: x varies inversely with the square of y; x = 6 when y = 4.

8.Write a general formula to describe the variation: x varies inversely with the cube of y.

Answer 2

inverse variation means as one thing goes up the other goes down
the functions will be fractions, one will be in the denominator

1) let y^2 be in denominator
\[x = \frac{k}{y^2}\] solve for "k" using given point
6 = k/16 ---> k = 96

Answer 3

ok

Answer 4

\[x= -96/ \sqrt y\]

Answer 5

wait wrong

Answer 6

\[x= 96 \over y^2\]

Answer 7

@dumbcow

Answer 8

yes correct

Answer 9

Thanks :)

Answer 10

for 8) the general formula just leave the unknown constant "k"

x = k/y^3

Answer 11

ohhh so its x= k/y^3?

Answer 12

for the 2nd question yes

Answer 13

yay! thanks

Answer 14

i get the words mixed up sometimes but 8 was obvious -_-

Answer 15

haha :)

Answer 16

ok i have 1 more question if that is ok

Answer 17

Suppose that the time it takes to do a job is inversely proportional to the number of workers. That is, the more workers on the job the less time required to complete the job. If it takes 3 workers 16 days to finish a job, how long will it take 8 workers?

Answer 18

@dumbcow