Question

The variables x and y vary inversely. Which equation relates x and y when x = -1 and y = -9?

Answer 1

K=1 OVER 9

Answer 2

then what do I do?..

Answer 3

We're supposed to try at explain @JULIANCHICO .. but a variables that vary inversely have the formula \[y = \frac{ k }{ x^2 }\] With this being said, we fill in the numbers next to find what K is equal to. \[-9 = \frac{ k }{ 1 }\] multiply both sides by 1 to get rid of the fraction. K = -9. So the answer you want is: \[y = \frac{ -9 }{ x^2 }\]

Answer 4

thankyou

Answer 5

but none of the answers have x^2 in it..

Answer 6

what are your choices?

Answer 7

x = -y/9, y=-9x, x=9y, y=-9/x

Answer 8

ohh okay I found my mistake, I just assumed it was x^2 like what I have in algebra 2 at the moment. Hang on let me re-do it real quick.

Answer 9

okay

Answer 10

Interesting..when I re-do it I keep getting y = 9/x

Answer 11

hmm