ANSWER
D. 5
Step-by-step explanation
We have to find the constant of proportionality in the equation:
![y=5x](https://img.qammunity.org/2023/formulas/mathematics/college/jol6ror4d9t70lnazcipv4i15lgm6rqrje.png)
The general form of a proportional relationship is:
![y=kx](https://img.qammunity.org/2023/formulas/mathematics/college/zfnjlk9kn7jg7cyy0nlnepmsiaxj3b2oge.png)
where k = constant of proportionality
Therefore, comparing the given equation with the general equation, the constant of proportionality is 5.