Question

Which relationship shows an inverse variation?
Choices:
x = 1, 2, 3, 4
y = 3, 6, 9, 12
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x = 1, 2, 3, 4
y = 60, 30, 20, 15
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x = 1, 2, 3, 4
y = 15, 13, 11, 9
---------------
x = 1, 2, 3, 4
y = 6, 11, 20, 35

Answer 1

find ,xy in each case,
the one in which xy has same value, will have inverse variation.

Answer 2

Can you give me an example?

Answer 3

i'll do first choice for you.
xy =1*3 =3
xy=2*6=12
not same , so its not inverse var.

Answer 4

one more, last option :
xy=1*6 =6
xy =2*11 = 22
not same, so not inverse variation.

Answer 5

you try for other 2.

Answer 6

x = 1, 2, 3, 4
y = 60, 30, 20, 15 I htink its this one

Answer 7

yes! and the product everytime , xy =.... ?

Answer 8

sorry my computer is going very slow its 5?Im just guessing here

Answer 9

no... see,
xy = 1*60 =60
xy = 2*30=60
xy=3*20=60
xy = 4*15=60
so, everytime xy=60
hence your function is xy=60 and is an inverse variation .
if you were asked direct variation, you would have checked x/y=...

Answer 10

understood ?