Question

The following graph shows a proportional relationship.

What is the constant of proportionality between y and x in the graph?

Answer 1

`k=2`

Explanation:

The constant of proportionality is given as
`k=(y)/(x)` .

Notice that when
`x=2` it follows that
`y=4`.

Substitute
`x=2` and
`y=4` into the formula for the constant:

`k=(4)/(2)=2` .

Therefore, the constant is equal to 2.