Question

For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. (Hint: you need to find the “k” value)

Answer 1

The table:
X | Y
20 | 2
30 | 10
40 | 18

Answer 2

On the answer key, it says that Y doesn't vary with X but what I'm not understanding is why Y doesn't vary with X. Because from looking at the table, X increases by 10 and Y increases by 8. And 8/10 could be simplified.

Answer 3

@Nnesha

Answer 4

@Answers101 solve again for the values of K , if they are not on the same trend, they do not vary

Answer 5

I'm just not understanding how Y does not vary with X.

Answer 6

when x rises , y should rise also and vice versa, if x is the same, y should also be the same. Applies to all direct variation. Solving for K for each values of x and y will give you a conclusion wether it varies or not, just like what we did before.

Answer 7

its not because you are not getting answer whenever you divide or multiply

Answer 8

same**

Answer 9

which prooves my point :)

Answer 10

Dont just look on what you see in the table, solve for the value of K! :)

Answer 11

equation now you have to find k so solve this equation for k

Answer 12

@Nnesha you mean, divide both sides by " x "

Answer 13

I thought that in this problem, Y would equal 8/10x ??

Answer 14

yes i meant by x thanks

Answer 15

and simply way is when you multiply x and y values you are not getting same answer that's why its not

Answer 16

@Answers101 where did you get 8/ 10

that is the value of k right ?

Answer 17

@Nnesha ^^ agreed

Answer 18

nope

Answer 19

I got 8/10 from looking at the table, X increases by 10 and Y increases by 8..

Answer 20

@Answers101 dont look at the table , solve for the value of K.

Answer 21

I thought that when you look at the table that is how you solve for the value of K.

Answer 22

if you want to solve for k