Question

State whether the relationship between the variables in the table is a direct variation, an inverse variation, or neither. If it is a direct or inverse variation, write a function to model it.

x
3
9
13
20

y
9
27
39
60

Answer 1

check : if the product xy is constant for all pairs of x,y then the variation is inverse,
but if the ratio y/x is constant for all pairs of x,y then the variation is direct.

Answer 2

huh?

Answer 3

its direct

Answer 4

This is a direct variation, because as x increases, so does y.
In other words both increase in the same direction, namely up.
y = 3x

Answer 5

y/x = 9/3 = 3
y/x = 27/9 =3
y/x = 39/13 =3 ?

Answer 6

YEAH
You forgot the variable though!

Answer 7

3x?

Answer 8

9=k *3
---> k=3
so, y=3x :)?

Answer 9

YEAH! :D

Answer 10

woohoo!

Answer 11

YEAH! WAY TO GO! :D

Answer 12

Thanks dude! :P

Answer 13

You welcome!