you didn't give the options but constant of proportionality is a number you have to multiply x by to get y.
y=kx is the equation that expresses the proportionality of x and y
the constant of proportionality is k, so k=2
y= kx becomes y=2x
so y = 2x should be the answer
Answer:
[tex]y=2x[/tex]
Step-by-step explanation:
We are given that
The proportion constant=k=2
We know that
Direct proportion: When one quantity increases then other quantity is also increase.When one quantity decreases then other quantity is also decrease.
Mathematical representation:Let one quantity= x and second quantity=y
[tex]y\propto x[/tex]
[tex]y=kx[/tex]
Where k= Proportionality constant
Substitute the value of k
[tex]y=2x[/tex]
This is required equation which shows proportional relationship.
