Question

The graph of a proportional relationship passes through (9,18) and (1,y). Find y.

Answer 1

Your answer for y would be 2.
18/9=2.

Answer 2

`y=2`

Explanation:

The given points are
`(9,18)` and
`(1,y)`.

Notice that the relation between coordinates is: the vertical coordinate is double the horizontal one, that is,
`2(9)=18`.

So, we need to use the same proportion to find
`y`

`y=2(1)=2`

Therefore, the answer is 2.