y varies inversely with x. Find the inverse variation equation if x = -2.5 when y = 50.

Question

shayaan_mustafa · Answer

Hi kena :)

How are you dear?

Welocme to Openstudy

anonymous · Answer

lol , who are you ?

shayaan_mustafa · Answer

I am a user of Openstudy :)

anonymous · Answer

ohh hey are you good at alg1?

shayaan_mustafa · Answer

$$\large y\space\alpha\space\frac{1}{x}$$
$$\large y=k(\frac{1}{x})$$
Put x and y and find k

shayaan_mustafa · Answer

!!!!

anonymous · Answer

huh?

shayaan_mustafa · Answer

I told you to find the k form the given equation dear

anonymous · Answer

Can you solve the whole thing for me please???

shayaan_mustafa · Answer

OK. 

You have given x and y in the question. So put them in the equation like this.

$$\large 50=k(\frac{1}{-2.5})$$
$$\large -125=k$$
So your answer is 
k=-125

anonymous · Answer

The answers that is in the multiple choice is
A.y/x = -125 
B.xy = -125 
C.y/x = -20 
D.xy = -20

shayaan_mustafa · Answer

It is B.

anonymous · Answer

The amount of information retained varies inversely with the number of hours passed since the information was given. If Diana can retain 20 new vocabulary words 1/4 hour after she learns them, how many will she retain 2.5 hours after she reads them?